Use driver() instead of $driver

2025-08-05 06:07:57 +02:00 · 2025-03-29 21:00:44 +01:00
parent 845445baad
commit 168ea5ae6d
22 changed files with 83 additions and 109 deletions
--- a/adminer/check.inc.php
+++ b/adminer/check.inc.php
@@ -24,7 +24,7 @@ if ($row && !$error) {
 page_header(($name != "" ? lang('Alter check') . ": " . h($name) : lang('Create check')), $error, array("table" => $TABLE));

 if (!$row) {
-	$checks = $driver->checkConstraints($TABLE);
+	$checks = driver()->checkConstraints($TABLE);
 	$row = array("name" => $name, "clause" => $checks[$name]);
 }
 ?>
--- a/adminer/create.inc.php
+++ b/adminer/create.inc.php
@@ -140,7 +140,7 @@ if ($_POST && !process_fields($row["fields"]) && !$error) {
 page_header(($TABLE != "" ? lang('Alter table') : lang('Create table')), $error, array("table" => $TABLE), h($TABLE));

 if (!$_POST) {
-	$types = $driver->types();
+	$types = driver()->types();
 	$row = array(
 		"Engine" => $_COOKIE["adminer_engine"],
 		"fields" => array(array("field" => "", "type" => (isset($types["int"]) ? "int" : (isset($types["integer"]) ? "integer" : "")), "on_update" => "")),
@@ -171,7 +171,7 @@ $collations = collations();
 if (is_array(reset($collations))) {
 	$collations = call_user_func_array('array_merge', array_values($collations));
 }
-$engines = $driver->engines();
+$engines = driver()->engines();
 // case of engine may differ
 foreach ($engines as $engine) {
 	if (!strcasecmp($engine, $row["Engine"])) {
--- a/adminer/db.inc.php
+++ b/adminer/db.inc.php
@@ -69,7 +69,7 @@ if (adminer()->homepage()) {
 				echo " <input type='submit' name='search' value='" . lang('Search') . "'>\n";
 				echo "</div></fieldset>\n";
 				if ($_POST["search"] && $_POST["query"] != "") {
-					$_GET["where"][0]["op"] = $driver->convertOperator("LIKE %%");
+					$_GET["where"][0]["op"] = driver()->convertOperator("LIKE %%");
 					search_tables();
 				}
 			}
--- a/adminer/download.inc.php
+++ b/adminer/download.inc.php
@@ -6,7 +6,7 @@ $fields = fields($TABLE);
 header("Content-Type: application/octet-stream");
 header("Content-Disposition: attachment; filename=" . friendly_url("$TABLE-" . implode("_", $_GET["where"])) . "." . friendly_url($_GET["field"]));
 $select = array(idf_escape($_GET["field"]));
-$result = $driver->select($TABLE, $select, array(where($_GET, $fields)), $select);
+$result = driver()->select($TABLE, $select, array(where($_GET, $fields)), $select);
 $row = ($result ? $result->fetch_row() : array());
-echo $driver->value($row[0], $fields[$_GET["field"]]);
+echo driver()->value($row[0], $fields[$_GET["field"]]);
 exit; // don't output footer
--- a/adminer/drivers/mssql.inc.php
+++ b/adminer/drivers/mssql.inc.php
@@ -640,7 +640,6 @@ WHERE sys1.xtype = 'TR' AND sys2.name = " . q($table)) as $row
 	}

 	function create_sql($table, $auto_increment, $style) {
-		global $driver;
 		if (is_view(table_status1($table))) {
 			$view = view($table);
 			return "CREATE VIEW " . table($table) . " AS $view[select]";
@@ -664,7 +663,7 @@ WHERE sys1.xtype = 'TR' AND sys2.name = " . q($table)) as $row
 				$fields[] = ($index["type"] == "INDEX" ? "INDEX $name" : "CONSTRAINT $name " . ($index["type"] == "UNIQUE" ? "UNIQUE" : "PRIMARY KEY")) . " (" . implode(", ", $columns) . ")";
 			}
 		}
-		foreach ($driver->checkConstraints($table) as $name => $check) {
+		foreach (driver()->checkConstraints($table) as $name => $check) {
 			$fields[] = "CONSTRAINT " . idf_escape($name) . " CHECK ($check)";
 		}
 		return "CREATE TABLE " . table($table) . " (\n\t" . implode(",\n\t", $fields) . "\n)";
--- a/adminer/drivers/mysql.inc.php
+++ b/adminer/drivers/mysql.inc.php
@@ -556,13 +556,12 @@ if (!defined('Adminer\DRIVER')) {
 	* @return ForeignKey[]
 	*/
 	function foreign_keys(string $table): array {
-		global $driver;
 		static $pattern = '(?:`(?:[^`]|``)+`|"(?:[^"]|"")+")';
 		$return = array();
 		$create_table = get_val("SHOW CREATE TABLE " . table($table), 1);
 		if ($create_table) {
 			preg_match_all(
-				"~CONSTRAINT ($pattern) FOREIGN KEY ?\\(((?:$pattern,? ?)+)\\) REFERENCES ($pattern)(?:\\.($pattern))? \\(((?:$pattern,? ?)+)\\)(?: ON DELETE ($driver->onActions))?(?: ON UPDATE ($driver->onActions))?~",
+				"~CONSTRAINT ($pattern) FOREIGN KEY ?\\(((?:$pattern,? ?)+)\\) REFERENCES ($pattern)(?:\\.($pattern))? \\(((?:$pattern,? ?)+)\\)(?: ON DELETE (driver()->onActions))?(?: ON UPDATE (driver()->onActions))?~",
 				$create_table,
 				$matches,
 				PREG_SET_ORDER
@@ -860,13 +859,12 @@ if (!defined('Adminer\DRIVER')) {
 	* @return Routine
 	*/
 	function routine(string $name, string $type): array {
-		global $driver;
 		$aliases = array("bool", "boolean", "integer", "double precision", "real", "dec", "numeric", "fixed", "national char", "national varchar");
 		$space = "(?:\\s|/\\*[\s\S]*?\\*/|(?:#|-- )[^\n]*\n?|--\r?\n)";
-		$enum = $driver->enumLength;
-		$type_pattern = "((" . implode("|", array_merge(array_keys($driver->types()), $aliases)) . ")\\b(?:\\s*\\(((?:[^'\")]|$enum)++)\\))?"
+		$enum = driver()->enumLength;
+		$type_pattern = "((" . implode("|", array_merge(array_keys(driver()->types()), $aliases)) . ")\\b(?:\\s*\\(((?:[^'\")]|$enum)++)\\))?"
 			. "\\s*(zerofill\\s*)?(unsigned(?:\\s+zerofill)?)?)(?:\\s*(?:CHARSET|CHARACTER\\s+SET)\\s*['\"]?([^'\"\\s,]+)['\"]?)?";
-		$pattern = "$space*(" . ($type == "FUNCTION" ? "" : $driver->inout) . ")?\\s*(?:`((?:[^`]|``)*)`\\s*|\\b(\\S+)\\s+)$type_pattern";
+		$pattern = "$space*(" . ($type == "FUNCTION" ? "" : driver()->inout) . ")?\\s*(?:`((?:[^`]|``)*)`\\s*|\\b(\\S+)\\s+)$type_pattern";
 		$create = get_val("SHOW CREATE $type " . idf_escape($name), 2);
 		preg_match("~\\(((?:$pattern\\s*,?)*)\\)\\s*" . ($type == "FUNCTION" ? "RETURNS\\s+$type_pattern\\s+" : "") . "(.*)~is", $create, $match);
 		$fields = array();
--- a/adminer/drivers/pgsql.inc.php
+++ b/adminer/drivers/pgsql.inc.php
@@ -484,7 +484,6 @@ ORDER BY indisprimary DESC, indisunique DESC", $connection2) as $row
 	}

 	function foreign_keys($table) {
-		global $driver;
 		$return = array();
 		foreach (
 			get_rows("SELECT conname, condeferrable::int AS deferrable, pg_get_constraintdef(oid) AS definition
@@ -500,8 +499,8 @@ ORDER BY conkey, conname") as $row
 					$row['table'] = idf_unescape($match2[4]);
 				}
 				$row['target'] = array_map('Adminer\idf_unescape', array_map('trim', explode(',', $match[3])));
-				$row['on_delete'] = (preg_match("~ON DELETE ($driver->onActions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
-				$row['on_update'] = (preg_match("~ON UPDATE ($driver->onActions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
+				$row['on_delete'] = (preg_match("~ON DELETE (driver()->onActions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
+				$row['on_update'] = (preg_match("~ON UPDATE (driver()->onActions)~", $match[4], $match2) ? $match2[1] : 'NO ACTION');
 				$return[$row['conname']] = $row;
 			}
 		}
@@ -793,12 +792,12 @@ AND typelem = 0"
 	}

 	function set_schema($schema, $connection2 = null) {
-		global $connection, $driver;
+		global $connection;
 		if (!$connection2) {
 			$connection2 = $connection;
 		}
 		$return = $connection2->query("SET search_path TO " . idf_escape($schema));
-		$driver->setUserTypes(types()); //! get types from current_schemas('t')
+		driver()->setUserTypes(types()); //! get types from current_schemas('t')
 		return $return;
 	}

@@ -820,7 +819,6 @@ AND typelem = 0"
 	}

 	function create_sql($table, $auto_increment, $style) {
-		global $driver;
 		$return_parts = array();
 		$sequences = array();

@@ -872,7 +870,7 @@ AND typelem = 0"
 			}
 		}

-		foreach ($driver->checkConstraints($table) as $conname => $consrc) {
+		foreach (driver()->checkConstraints($table) as $conname => $consrc) {
 			$return_parts[] = "CONSTRAINT " . idf_escape($conname) . " CHECK $consrc";
 		}

--- a/adminer/drivers/sqlite.inc.php
+++ b/adminer/drivers/sqlite.inc.php
@@ -459,7 +459,6 @@ if (isset($_GET["sqlite"])) {
 	* @param string $add_check CHECK constraint to add
 	*/
 	function recreate_table(string $table, string $name, array $fields, array $originals, array $foreign, int $auto_increment = 0, $indexes = array(), string $drop_check = "", string $add_check = ""): bool {
-		global $driver;
 		if ($table != "") {
 			if (!$fields) {
 				foreach (fields($table) as $key => $field) {
@@ -524,7 +523,7 @@ if (isset($_GET["sqlite"])) {
 			$changes[] = "  " . implode($field);
 		}
 		$changes = array_merge($changes, array_filter($foreign));
-		foreach ($driver->checkConstraints($table) as $check) {
+		foreach (driver()->checkConstraints($table) as $check) {
 			if ($check != $drop_check) {
 				$changes[] = "  CHECK ($check)";
 			}
--- a/adminer/edit.inc.php
+++ b/adminer/edit.inc.php
@@ -27,7 +27,7 @@ if ($_POST && !$error && !isset($_GET["select"])) {
 		queries_redirect(
 			$location,
 			lang('Item has been deleted.'),
-			$driver->delete($TABLE, $query_where, !$unique_array)
+			driver()->delete($TABLE, $query_where, !$unique_array)
 		);

 	} else {
@@ -46,7 +46,7 @@ if ($_POST && !$error && !isset($_GET["select"])) {
 			queries_redirect(
 				$location,
 				lang('Item has been updated.'),
-				$driver->update($TABLE, $set, $query_where, !$unique_array)
+				driver()->update($TABLE, $set, $query_where, !$unique_array)
 			);
 			if (is_ajax()) {
 				page_headers();
@@ -54,7 +54,7 @@ if ($_POST && !$error && !isset($_GET["select"])) {
 				exit;
 			}
 		} else {
-			$result = $driver->insert($TABLE, $set);
+			$result = driver()->insert($TABLE, $set);
 			$last_id = ($result ? last_id($result) : 0);
 			queries_redirect($location, lang('Item%s has been inserted.', ($last_id ? " $last_id" : "")), $result); //! link
 		}
@@ -77,7 +77,7 @@ if ($_POST["save"]) {
 		$select = array("*");
 	}
 	if ($select) {
-		$result = $driver->select($TABLE, $select, array($where), $select, array(), (isset($_GET["select"]) ? 2 : 1));
+		$result = driver()->select($TABLE, $select, array($where), $select, array(), (isset($_GET["select"]) ? 2 : 1));
 		if (!$result) {
 			$error = error();
 		} else {
@@ -94,10 +94,10 @@ if ($_POST["save"]) {

 if (!support("table") && !$fields) { // used by Mongo and SimpleDB
 	if (!$where) { // insert
-		$result = $driver->select($TABLE, array("*"), $where, array("*"));
+		$result = driver()->select($TABLE, array("*"), $where, array("*"));
 		$row = ($result ? $result->fetch_assoc() : false);
 		if (!$row) {
-			$row = array($driver->primary => "");
+			$row = array(driver()->primary => "");
 		}
 	}
 	if ($row) {
@@ -105,7 +105,7 @@ if (!support("table") && !$fields) { // used by Mongo and SimpleDB
 			if (!$where) {
 				$row[$key] = null;
 			}
-			$fields[$key] = array("field" => $key, "null" => ($key != $driver->primary), "auto_increment" => ($key == $driver->primary));
+			$fields[$key] = array("field" => $key, "null" => ($key != driver()->primary), "auto_increment" => ($key == driver()->primary));
 		}
 	}
 }
--- a/adminer/foreign.inc.php
+++ b/adminer/foreign.inc.php
@@ -101,8 +101,8 @@ foreach ($row["source"] as $key => $val) {
 ?>
 </table>
 <p>
-<?php echo lang('ON DELETE'); ?>: <?php echo html_select("on_delete", array(-1 => "") + explode("|", $driver->onActions), $row["on_delete"]); ?>
- <?php echo lang('ON UPDATE'); ?>: <?php echo html_select("on_update", array(-1 => "") + explode("|", $driver->onActions), $row["on_update"]); ?>
+<?php echo lang('ON DELETE'); ?>: <?php echo html_select("on_delete", array(-1 => "") + explode("|", driver()->onActions), $row["on_delete"]); ?>
+ <?php echo lang('ON UPDATE'); ?>: <?php echo html_select("on_update", array(-1 => "") + explode("|", driver()->onActions), $row["on_update"]); ?>
 <?php echo doc_link(array(
 	'sql' => "innodb-foreign-key-constraints.html",
 	'mariadb' => "foreign-keys/",
--- a/adminer/include/adminer.inc.php
+++ b/adminer/include/adminer.inc.php
@@ -64,8 +64,7 @@ class Adminer {
 	* @return list<string> operators
 	*/
 	function operators(): array {
-		global $driver;
-		return $driver->operators;
+		return driver()->operators;
 	}

 	/** Get list of schemas
@@ -175,7 +174,6 @@ class Adminer {
 	* @param ?string $set new item options, NULL for no new item
 	*/
 	function selectLinks(array $tableStatus, ?string $set = ""): void {
-		global $driver;
 		echo '<p class="links">';
 		$links = array("select" => lang('Select data'));
 		if (support("table") || support("indexes")) {
@@ -197,7 +195,7 @@ class Adminer {
 		foreach ($links as $key => $val) {
 			echo " <a href='" . h(ME) . "$key=" . urlencode($name) . ($key == "edit" ? $set : "") . "'" . bold(isset($_GET[$key])) . ">$val</a>";
 		}
-		echo doc_link(array(JUSH => $driver->tableHelp($name, $is_view)), "?");
+		echo doc_link(array(JUSH => driver()->tableHelp($name, $is_view)), "?");
 		echo "\n";
 	}

@@ -227,9 +225,8 @@ class Adminer {
 	* @param float $start start time of the query
 	*/
 	function selectQuery(string $query, float $start, bool $failed = false): string {
-		global $driver;
 		$return = "</p>\n"; // required for IE9 inline edit
-		if (!$failed && ($warnings = $driver->warnings())) {
+		if (!$failed && ($warnings = driver()->warnings())) {
 			$id = "warnings";
 			$return = ", <a href='#$id'>" . lang('Warnings') . "</a>" . script("qsl('a').onclick = partial(toggle, '$id');", "")
 				. "$return<div id='$id' class='hidden'>\n$warnings</div>\n"
@@ -307,11 +304,10 @@ class Adminer {
 	* @param TableStatus $tableStatus
 	*/
 	function tableStructurePrint(array $fields, array $tableStatus = null): void {
-		global $driver;
 		echo "<div class='scrollable'>\n";
 		echo "<table class='nowrap odds'>\n";
 		echo "<thead><tr><th>" . lang('Column') . "<td>" . lang('Type') . (support("comment") ? "<td>" . lang('Comment') : "") . "</thead>\n";
-		$structured_types = $driver->structuredTypes();
+		$structured_types = driver()->structuredTypes();
 		foreach ($fields as $field) {
 			echo "<tr><th>" . h($field["field"]);
 			$type = h($field["full_type"]);
@@ -357,7 +353,6 @@ class Adminer {
 	* @param string[] $columns selectable columns
 	*/
 	function selectColumnsPrint(array $select, array $columns): void {
-		global $driver;
 		print_fieldset("select", lang('Select'), $select);
 		$i = 0;
 		$select[""] = array();
@@ -369,7 +364,7 @@ class Adminer {
 				$val["col"],
 				($key !== "" ? "selectFieldChange" : "selectAddRow")
 			);
-			echo "<div>" . ($driver->functions || $driver->grouping ? html_select("columns[$i][fun]", array(-1 => "") + array_filter(array(lang('Functions') => $driver->functions, lang('Aggregation') => $driver->grouping)), $val["fun"])
+			echo "<div>" . (driver()->functions || driver()->grouping ? html_select("columns[$i][fun]", array(-1 => "") + array_filter(array(lang('Functions') => driver()->functions, lang('Aggregation') => driver()->grouping)), $val["fun"])
 				. on_help("event.target.value && event.target.value.replace(/ |\$/, '(') + ')'", 1)
 				. script("qsl('select').onchange = function () { helpClose();" . ($key !== "" ? "" : " qsl('select, input', this.parentNode).onchange();") . " };", "")
 				. "($column)" : $column) . "</div>\n";
@@ -507,13 +502,12 @@ class Adminer {
 	* @return list<list<string>> [[select_expressions], [group_expressions]]
 	*/
 	function selectColumnsProcess(array $columns, array $indexes): array {
-		global $driver;
 		$select = array(); // select expressions, empty for *
 		$group = array(); // expressions without aggregation - will be used for GROUP BY if an aggregation function is used
 		foreach ((array) $_GET["columns"] as $key => $val) {
-			if ($val["fun"] == "count" || ($val["col"] != "" && (!$val["fun"] || in_array($val["fun"], $driver->functions) || in_array($val["fun"], $driver->grouping)))) {
+			if ($val["fun"] == "count" || ($val["col"] != "" && (!$val["fun"] || in_array($val["fun"], driver()->functions) || in_array($val["fun"], driver()->grouping)))) {
 				$select[$key] = apply_sql_function($val["fun"], ($val["col"] != "" ? idf_escape($val["col"]) : "*"));
-				if (!in_array($val["fun"], $driver->grouping)) {
+				if (!in_array($val["fun"], driver()->grouping)) {
 					$group[] = $select[$key];
 				}
 			}
@@ -527,7 +521,7 @@ class Adminer {
 	* @return list<string> expressions to join by AND
 	*/
 	function selectSearchProcess(array $fields, array $indexes): array {
-		global $connection, $driver;
+		global $connection;
 		$return = array();
 		foreach ($indexes as $i => $index) {
 			if ($index["type"] == "FULLTEXT" && $_GET["fulltext"][$i] != "") {
@@ -554,7 +548,7 @@ class Adminer {
 					$cond .= " " . adminer()->processInput($fields[$val["col"]], $val["val"]);
 				}
 				if ($val["col"] != "") {
-					$return[] = $prefix . $driver->convertSearch(idf_escape($val["col"]), $val, $fields[$val["col"]]) . $cond;
+					$return[] = $prefix . driver()->convertSearch(idf_escape($val["col"]), $val, $fields[$val["col"]]) . $cond;
 				} else {
 					// find anywhere
 					$cols = array();
@@ -565,7 +559,7 @@ class Adminer {
 							&& (!preg_match("~[\x80-\xFF]~", $val["val"]) || preg_match('~char|text|enum|set~', $field["type"]))
 							&& (!preg_match('~date|timestamp~', $field["type"]) || preg_match('~^\d+-\d+-\d+~', $val["val"]))
 						) {
-							$cols[] = $prefix . $driver->convertSearch(idf_escape($name), $val, $field) . $cond;
+							$cols[] = $prefix . driver()->convertSearch(idf_escape($name), $val, $field) . $cond;
 						}
 					}
 					$return[] = ($cols ? "(" . implode(" OR ", $cols) . ")" : "1 = 0");
@@ -633,7 +627,6 @@ class Adminer {
 	* @param string $time elapsed time
 	*/
 	function messageQuery(string $query, string $time, bool $failed = false): string {
-		global $driver;
 		restart_session();
 		$history = &get_session("queries");
 		if (!idx($history, $_GET["db"])) {
@@ -645,7 +638,7 @@ class Adminer {
 		$history[$_GET["db"]][] = array($query, time(), $time); // not DB - $_GET["db"] is changed in database.inc.php //! respect $_GET["ns"]
 		$sql_id = "sql-" . count($history[$_GET["db"]]);
 		$return = "<a href='#$sql_id' class='toggle'>" . lang('SQL command') . "</a>\n";
-		if (!$failed && ($warnings = $driver->warnings())) {
+		if (!$failed && ($warnings = driver()->warnings())) {
 			$id = "warnings-" . count($history[$_GET["db"]]);
 			$return = "<a href='#$id' class='toggle'>" . lang('Warnings') . "</a>, $return<div id='$id' class='hidden'>\n$warnings</div>\n";
 		}
@@ -669,10 +662,9 @@ class Adminer {
 	* @return list<string>
 	*/
 	function editFunctions(array $field): array {
-		global $driver;
 		$return = ($field["null"] ? "NULL/" : "");
 		$update = isset($_GET["select"]) || where($_GET);
-		foreach (array($driver->insertFunctions, $driver->editFunctions) as $key => $functions) {
+		foreach (array(driver()->insertFunctions, driver()->editFunctions) as $key => $functions) {
 			if (!$key || (!isset($_GET["call"]) && $update)) { // relative functions
 				foreach ($functions as $pattern => $val) {
 					if (!$pattern || preg_match("~$pattern~", $field["type"])) {
--- a/adminer/include/auth.inc.php
+++ b/adminer/include/auth.inc.php
@@ -177,7 +177,7 @@ if (isset($_GET["username"]) && is_string(get_password())) {
 	check_invalid_login($permanent);
 	$connection = connect(adminer()->credentials());
 	if (is_object($connection)) {
-		$driver = new Driver($connection);
+		Driver::$instance = new Driver($connection);
 		if ($connection->flavor) {
 			save_settings(array("vendor-" . DRIVER . "-" . SERVER => get_driver(DRIVER)));
 		}
--- a/adminer/include/bootstrap.inc.php
+++ b/adminer/include/bootstrap.inc.php
@@ -39,7 +39,7 @@ if ($_GET["script"] == "version") {
 	exit;
 }

-global $connection, $driver, $translations; // allows including Adminer inside a function
+global $connection, $translations; // allows including Adminer inside a function

 if (!$_SERVER["REQUEST_URI"]) { // IIS 5 compatibility
 	$_SERVER["REQUEST_URI"] = $_SERVER["ORIG_PATH_INFO"];
--- a/adminer/include/driver.inc.php
+++ b/adminer/include/driver.inc.php
@@ -12,8 +12,9 @@ function get_driver(string $id): string {
 }

 abstract class SqlDriver {
-	/** @var string[] */ static array $drivers = array();
-	/** @var list<string> */ static array $extensions = array(); // possible extensions
+	static Driver $instance;
+	/** @var string[] */ static array $drivers = array(); // all available drivers
+	/** @var list<string> */ static array $extensions = array(); // possible extensions in the current driver
 	static string $jush; // JUSH identifier

 	protected Db $conn;
--- a/adminer/include/editing.inc.php
+++ b/adminer/include/editing.inc.php
@@ -172,13 +172,12 @@ function json_row(string $key, $val = null): void {
 * @param list<string> $extra_types extra types to prepend
 */
 function edit_type(string $key, array $field, array $collations, array $foreign_keys = array(), array $extra_types = array()): void {
-	global $driver;
 	$type = $field["type"];
 	echo "<td><select name='" . h($key) . "[type]' class='type' aria-labelledby='label-type'>";
-	if ($type && !array_key_exists($type, $driver->types()) && !isset($foreign_keys[$type]) && !in_array($type, $extra_types)) {
+	if ($type && !array_key_exists($type, driver()->types()) && !isset($foreign_keys[$type]) && !in_array($type, $extra_types)) {
 		$extra_types[] = $type;
 	}
-	$structured_types = $driver->structuredTypes();
+	$structured_types = driver()->structuredTypes();
 	if ($foreign_keys) {
 		$structured_types[lang('Foreign keys')] = $foreign_keys;
 	}
@@ -192,13 +191,13 @@ function edit_type(string $key, array $field, array $collations, array $foreign_
 		? "<input list='collations' name='" . h($key) . "[collation]'" . (preg_match('~(char|text|enum|set)$~', $type) ? "" : " class='hidden'") . " value='" . h($field["collation"]) . "' placeholder='(" . lang('collation') . ")'>"
 		: ''
 	);
-	echo ($driver->unsigned ? "<select name='" . h($key) . "[unsigned]'" . (!$type || preg_match(number_type(), $type) ? "" : " class='hidden'") . '><option>' . optionlist($driver->unsigned, $field["unsigned"]) . '</select>' : '');
+	echo (driver()->unsigned ? "<select name='" . h($key) . "[unsigned]'" . (!$type || preg_match(number_type(), $type) ? "" : " class='hidden'") . '><option>' . optionlist(driver()->unsigned, $field["unsigned"]) . '</select>' : '');
 	echo (isset($field['on_update']) ? "<select name='" . h($key) . "[on_update]'" . (preg_match('~timestamp|datetime~', $type) ? "" : " class='hidden'") . '>'
 		. optionlist(array("" => "(" . lang('ON UPDATE') . ")", "CURRENT_TIMESTAMP"), (preg_match('~^CURRENT_TIMESTAMP~i', $field["on_update"]) ? "CURRENT_TIMESTAMP" : $field["on_update"]))
 		. '</select>' : ''
 	);
 	echo ($foreign_keys
-		? "<select name='" . h($key) . "[on_delete]'" . (preg_match("~`~", $type) ? "" : " class='hidden'") . "><option value=''>(" . lang('ON DELETE') . ")" . optionlist(explode("|", $driver->onActions), $field["on_delete"]) . "</select> "
+		? "<select name='" . h($key) . "[on_delete]'" . (preg_match("~`~", $type) ? "" : " class='hidden'") . "><option value=''>(" . lang('ON DELETE') . ")" . optionlist(explode("|", driver()->onActions), $field["on_delete"]) . "</select> "
 		: " " // space for IE
 	);
 }
@@ -220,8 +219,7 @@ function get_partitions_info(string $table): array {

 /** Filter length value including enums */
 function process_length(?string $length): string {
-	global $driver;
-	$enum_length = $driver->enumLength;
+	$enum_length = driver()->enumLength;
 	return (preg_match("~^\\s*\\(?\\s*$enum_length(?:\\s*,\\s*$enum_length)*+\\s*\\)?\\s*\$~", $length) && preg_match_all("~$enum_length~", $length, $matches)
 		? "(" . implode(",", $matches[0]) . ")"
 		: preg_replace('~^[0-9].*~', '(\0)', preg_replace('~[^-0-9,+()[\]]~', '', $length))
@@ -232,10 +230,9 @@ function process_length(?string $length): string {
 * @param FieldType $field
 */
 function process_type(array $field, string $collate = "COLLATE"): string {
-	global $driver;
 	return " $field[type]"
 		. process_length($field["length"])
-		. (preg_match(number_type(), $field["type"]) && in_array($field["unsigned"], $driver->unsigned) ? " $field[unsigned]" : "")
+		. (preg_match(number_type(), $field["type"]) && in_array($field["unsigned"], driver()->unsigned) ? " $field[unsigned]" : "")
 		. (preg_match('~char|text|enum|set~', $field["type"]) && $field["collation"] ? " $collate " . (JUSH == "mssql" ? $field["collation"] : q($field["collation"])) : "")
 	;
 }
@@ -265,10 +262,9 @@ function process_field(array $field, array $type_field): array {
 * @param Field $field
 */
 function default_value(array $field): string {
-	global $driver;
 	$default = $field["default"];
 	$generated = $field["generated"];
-	return ($default === null ? "" : (in_array($generated, $driver->generated)
+	return ($default === null ? "" : (in_array($generated, driver()->generated)
 		? (JUSH == "mssql" ? " AS ($default)" . ($generated == "VIRTUAL" ? "" : " $generated") . "" : " GENERATED ALWAYS AS ($default) $generated")
 		: " DEFAULT " . (!preg_match('~^GENERATED ~i', $default) && (preg_match('~char|binary|text|json|enum|set~', $field["type"]) || preg_match('~^(?![a-z])~i', $default))
 			? (JUSH == "sql" && preg_match('~text|json~', $field["type"]) ? "(" . q($default) . ")" : q($default)) // MySQL requires () around default value of text column
@@ -302,7 +298,6 @@ function type_class(string $type) {
 * @param string[] $foreign_keys
 */
 function edit_fields(array $fields, array $collations, $type = "TABLE", array $foreign_keys = array()): void {
-	global $driver;
 	$fields = array_values($fields);
 	$default_class = (($_POST ? $_POST["defaults"] : get_setting("defaults")) ? "" : " class='hidden'");
 	$comment_class = (($_POST ? $_POST["comments"] : get_setting("comments")) ? "" : " class='hidden'");
@@ -333,7 +328,7 @@ function edit_fields(array $fields, array $collations, $type = "TABLE", array $f
 		$orig = $field[($_POST ? "orig" : "field")];
 		$display = (isset($_POST["add"][$i-1]) || (isset($field["field"]) && !idx($_POST["drop_col"], $i))) && (support("drop_col") || $orig == "");
 		echo "<tr" . ($display ? "" : " style='display: none;'") . ">\n";
-		echo ($type == "PROCEDURE" ? "<td>" . html_select("fields[$i][inout]", explode("|", $driver->inout), $field["inout"]) : "") . "<th>";
+		echo ($type == "PROCEDURE" ? "<td>" . html_select("fields[$i][inout]", explode("|", driver()->inout), $field["inout"]) : "") . "<th>";
 		if ($display) {
 			echo "<input name='fields[$i][field]' value='" . h($field["field"]) . "' data-maxlength='64' autocapitalize='off' aria-labelledby='label-name'>";
 		}
@@ -342,8 +337,8 @@ function edit_fields(array $fields, array $collations, $type = "TABLE", array $f
 		if ($type == "TABLE") {
 			echo "<td>" . checkbox("fields[$i][null]", 1, $field["null"], "", "", "block", "label-null");
 			echo "<td><label class='block'><input type='radio' name='auto_increment_col' value='$i'" . ($field["auto_increment"] ? " checked" : "") . " aria-labelledby='label-ai'></label>";
-			echo "<td$default_class>" . ($driver->generated
-				? html_select("fields[$i][generated]", array_merge(array("", "DEFAULT"), $driver->generated), $field["generated"]) . " "
+			echo "<td$default_class>" . (driver()->generated
+				? html_select("fields[$i][generated]", array_merge(array("", "DEFAULT"), driver()->generated), $field["generated"]) . " "
 				: checkbox("fields[$i][generated]", 1, $field["generated"], "", "", "", "label-default")
 			);
 			echo "<input name='fields[$i][default]' value='" . h($field["default"]) . "' aria-labelledby='label-default'>";
@@ -472,13 +467,12 @@ function create_trigger(string $on, array $row): string {
 * @param Routine $row
 */
 function create_routine($routine, array $row): string {
-	global $driver;
 	$set = array();
 	$fields = (array) $row["fields"];
 	ksort($fields); // enforce fields order
 	foreach ($fields as $field) {
 		if ($field["field"] != "") {
-			$set[] = (preg_match("~^($driver->inout)\$~", $field["inout"]) ? "$field[inout] " : "") . idf_escape($field["field"]) . process_type($field, "CHARACTER SET");
+			$set[] = (preg_match("~^(driver()->inout)\$~", $field["inout"]) ? "$field[inout] " : "") . idf_escape($field["field"]) . process_type($field, "CHARACTER SET");
 		}
 	}
 	$definition = rtrim($row["definition"], ";");
@@ -500,7 +494,6 @@ function remove_definer(string $query): string {
 * @param ForeignKey $foreign_key
 */
 function format_foreign_key(array $foreign_key): string {
-	global $driver;
 	$db = $foreign_key["db"];
 	$ns = $foreign_key["ns"];
 	return " FOREIGN KEY (" . implode(", ", array_map('Adminer\idf_escape', $foreign_key["source"])) . ") REFERENCES "
@@ -508,8 +501,8 @@ function format_foreign_key(array $foreign_key): string {
 		. ($ns != "" && $ns != $_GET["ns"] ? idf_escape($ns) . "." : "")
 		. idf_escape($foreign_key["table"])
 		. " (" . implode(", ", array_map('Adminer\idf_escape', $foreign_key["target"])) . ")" //! reuse $name - check in older MySQL versions
-		. (preg_match("~^($driver->onActions)\$~", $foreign_key["on_delete"]) ? " ON DELETE $foreign_key[on_delete]" : "")
-		. (preg_match("~^($driver->onActions)\$~", $foreign_key["on_update"]) ? " ON UPDATE $foreign_key[on_update]" : "")
+		. (preg_match("~^(driver()->onActions)\$~", $foreign_key["on_delete"]) ? " ON DELETE $foreign_key[on_delete]" : "")
+		. (preg_match("~^(driver()->onActions)\$~", $foreign_key["on_update"]) ? " ON UPDATE $foreign_key[on_update]" : "")
 	;
 }

--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -19,8 +19,7 @@ function adminer() {

 /** Get Driver object */
 function driver(): Driver {
-	global $driver;
-	return $driver;
+	return Driver::$instance;
 }

 /** Unescape database identifier
@@ -601,7 +600,6 @@ function column_foreign_keys(string $table): array {
 * @return Field[] same as fields()
 */
 function fields_from_edit(): array { // used by Mongo and SimpleDB
-	global $driver;
 	$return = array();
 	foreach ((array) $_POST["field_keys"] as $key => $val) {
 		if ($val != "") {
@@ -616,7 +614,7 @@ function fields_from_edit(): array { // used by Mongo and SimpleDB
 			"field" => $name,
 			"privileges" => array("insert" => 1, "update" => 1, "where" => 1, "order" => 1),
 			"null" => 1,
-			"auto_increment" => ($key == $driver->primary),
+			"auto_increment" => ($key == driver()->primary),
 		);
 	}
 	return $return;
@@ -830,10 +828,9 @@ function count_rows(string $table, array $where, bool $is_group, array $group):
 * @return string[]
 */
 function slow_query(string $query): array {
-	global $driver;
 	$db = adminer()->database();
 	$timeout = adminer()->queryTimeout();
-	$slow_query = $driver->slowQuery($query, $timeout);
+	$slow_query = driver()->slowQuery($query, $timeout);
 	$connection2 = null;
 	if (!$slow_query && support("kill")) {
 		$connection2 = connect(adminer()->credentials());
--- a/adminer/include/html.inc.php
+++ b/adminer/include/html.inc.php
@@ -189,7 +189,6 @@ function enum_input(string $type, string $attrs, array $field, $value, string $e
 * @param mixed $value
 */
 function input(array $field, $value, ?string $function, ?bool $autofocus = false): void {
-	global $driver;
 	$name = h(bracket_escape($field["field"]));
 	echo "<td class='function'>";
 	if (is_array($value) && !$function) {
@@ -203,12 +202,12 @@ function input(array $field, $value, ?string $function, ?bool $autofocus = false
 	$functions = (isset($_GET["select"]) || $reset ? array("orig" => lang('original')) : array()) + adminer()->editFunctions($field);
 	$disabled = stripos($field["default"], "GENERATED ALWAYS AS ") === 0 ? " disabled=''" : "";
 	$attrs = " name='fields[$name]'$disabled" . ($autofocus ? " autofocus" : "");
-	$enums = $driver->enumLength($field);
+	$enums = driver()->enumLength($field);
 	if ($enums) {
 		$field["type"] = "enum";
 		$field["length"] = $enums;
 	}
-	echo $driver->unconvertFunction($field) . " ";
+	echo driver()->unconvertFunction($field) . " ";
 	$table = $_GET["edit"] ?: $_GET["select"];
 	if ($field["type"] == "enum") {
 		echo h($functions[""]) . "<td>" . adminer()->editInput($table, $field, $attrs, $value);
@@ -247,7 +246,7 @@ function input(array $field, $value, ?string $function, ?bool $autofocus = false
 			echo "<textarea$attrs>" . h($value) . '</textarea>';
 		} else {
 			// int(3) is only a display hint
-			$types = $driver->types();
+			$types = driver()->types();
 			$maxlength = (!preg_match('~int~', $field["type"]) && preg_match('~^(\d+)(,(\d+))?$~', $field["length"], $match)
 				? ((preg_match("~binary~", $field["type"]) ? 2 : 1) * $match[1] + ($match[3] ? 1 : 0) + ($match[2] && !$field["unsigned"] ? 1 : 0))
 				: ($types[$field["type"]] ? $types[$field["type"]] + ($field["unsigned"] ? 0 : 1) : 0)
@@ -283,14 +282,13 @@ function input(array $field, $value, ?string $function, ?bool $autofocus = false
 * @return mixed false to leave the original value
 */
 function process_input(array $field) {
-	global $driver;
 	if (stripos($field["default"], "GENERATED ALWAYS AS ") === 0) {
 		return;
 	}
 	$idf = bracket_escape($field["field"]);
 	$function = idx($_POST["function"], $idf);
 	$value = $_POST["fields"][$idf];
-	if ($field["type"] == "enum" || $driver->enumLength($field)) {
+	if ($field["type"] == "enum" || driver()->enumLength($field)) {
 		if ($value == -1) {
 			return false;
 		}
@@ -323,7 +321,7 @@ function process_input(array $field) {
 		if (!is_string($file)) {
 			return false; //! report errors
 		}
-		return $driver->quoteBinary($file);
+		return driver()->quoteBinary($file);
 	}
 	return adminer()->processInput($field, $value, $function);
 }
--- a/adminer/select.inc.php
+++ b/adminer/select.inc.php
@@ -46,7 +46,7 @@ if ($_GET["val"] && is_ajax()) {
 		$as = convert_field($fields[key($row)]);
 		$select = array($as ?: idf_escape(key($row)));
 		$where[] = where_check($unique_idf, $fields);
-		$return = $driver->select($TABLE, $select, $where, $select);
+		$return = driver()->select($TABLE, $select, $where, $select);
 		if ($return) {
 			echo first($return->fetch_row());
 		}
@@ -121,10 +121,10 @@ if ($_POST && !$error) {
 				$query = ($_POST["clone"] ? "INTO " . table($TABLE) . " (" . implode(", ", array_keys($set)) . ")\nSELECT " . implode(", ", $set) . "\nFROM " . table($TABLE) : "");
 				if ($_POST["all"] || ($primary && is_array($_POST["check"])) || $is_group) {
 					$result = ($_POST["delete"]
-						? $driver->delete($TABLE, $where_check)
+						? driver()->delete($TABLE, $where_check)
 						: ($_POST["clone"]
-							? queries("INSERT $query$where_check" . $driver->insertReturning($TABLE))
-							: $driver->update($TABLE, $set, $where_check)
+							? queries("INSERT $query$where_check" . driver()->insertReturning($TABLE))
+							: driver()->update($TABLE, $set, $where_check)
 						)
 					);
 					$affected = $connection->affected_rows;
@@ -136,10 +136,10 @@ if ($_POST && !$error) {
 						// where is not unique so OR can't be used
 						$where2 = "\nWHERE " . ($where ? implode(" AND ", $where) . " AND " : "") . where_check($val, $fields);
 						$result = ($_POST["delete"]
-							? $driver->delete($TABLE, $where2, 1)
+							? driver()->delete($TABLE, $where2, 1)
 							: ($_POST["clone"]
 								? queries("INSERT" . limit1($TABLE, $query, $where2))
-								: $driver->update($TABLE, $set, $where2, 1)
+								: driver()->update($TABLE, $set, $where2, 1)
 							)
 						);
 						if (!$result) {
@@ -176,7 +176,7 @@ if ($_POST && !$error) {
 						$key = bracket_escape($key, true); // true - back
 						$set[idf_escape($key)] = (preg_match('~char|text~', $fields[$key]["type"]) || $val != "" ? adminer()->processInput($fields[$key], $val) : "NULL");
 					}
-					$result = $driver->update(
+					$result = driver()->update(
 						$TABLE,
 						$set,
 						" WHERE " . ($where ? implode(" AND ", $where) . " AND " : "") . where_check($unique_idf, $fields),
@@ -201,7 +201,7 @@ if ($_POST && !$error) {
 			$cols = array_keys($fields);
 			preg_match_all('~(?>"[^"]*"|[^"\r\n]+)+~', $file, $matches);
 			$affected = count($matches[0]);
-			$driver->begin();
+			driver()->begin();
 			$separator = ($_POST["separator"] == "csv" ? "," : ($_POST["separator"] == "tsv" ? "\t" : ";"));
 			$rows = array();
 			foreach ($matches[0] as $key => $val) {
@@ -218,12 +218,12 @@ if ($_POST && !$error) {
 					$rows[] = $set;
 				}
 			}
-			$result = (!$rows || $driver->insertUpdate($TABLE, $rows, $primary));
+			$result = (!$rows || driver()->insertUpdate($TABLE, $rows, $primary));
 			if ($result) {
-				$driver->commit();
+				driver()->commit();
 			}
 			queries_redirect(remove_from_uri("page"), lang('%d row(s) have been imported.', $affected), $result);
-			$driver->rollback(); // after queries_redirect() to not overwrite error
+			driver()->rollback(); // after queries_redirect() to not overwrite error

 		}
 	}
@@ -299,7 +299,7 @@ if (!$columns && support("table")) {
 			}
 		}
 	}
-	$result = $driver->select($TABLE, $select2, $where, $group2, $order, $limit, $page, true);
+	$result = driver()->select($TABLE, $select2, $where, $group2, $order, $limit, $page, true);

 	if (!$result) {
 		echo "<p class='error'>" . error() . "\n";
@@ -411,7 +411,7 @@ if (!$columns && support("table")) {
 				foreach ($row as $key => $val) {
 					if (isset($names[$key])) {
 						$field = $fields[$key];
-						$val = $driver->value($val, $field);
+						$val = driver()->value($val, $field);
 						if ($val != "" && (!isset($email_fields[$key]) || $email_fields[$key] != "")) {
 							$email_fields[$key] = (is_mail($val) ? $names[$key] : ""); //! filled e-mails can be contained on other pages
 						}
--- a/adminer/sql.inc.php
+++ b/adminer/sql.inc.php
@@ -85,7 +85,7 @@ if (!$error && $_POST) {
 					$offset = $pos + strlen($found);

 					if ($found && rtrim($found) != $delimiter) { // find matching quote or comment end
-						$c_style_escapes = $driver->hasCStyleEscapes() || (JUSH == "pgsql" && ($pos > 0 && strtolower($query[$pos - 1]) == "e"));
+						$c_style_escapes = driver()->hasCStyleEscapes() || (JUSH == "pgsql" && ($pos > 0 && strtolower($query[$pos - 1]) == "e"));

 						$pattern = ($found == '/*' ? '\*/'
 							: ($found == '[' ? ']'
@@ -146,7 +146,7 @@ if (!$error && $_POST) {
 										. (strlen($q) < 1000 ? " <a href='" . h(ME) . "sql=" . urlencode(trim($q)) . "'>" . lang('Edit') . "</a>" : "") // 1000 - maximum length of encoded URL in IE is 2083 characters
 									;
 									$affected = $connection->affected_rows; // getting warnings overwrites this
-									$warnings = ($_POST["only_errors"] ? "" : $driver->warnings());
+									$warnings = ($_POST["only_errors"] ? "" : driver()->warnings());
 									$warnings_id = "warnings-$commands";
 									if ($warnings) {
 										$time .= ", <a href='#$warnings_id'>" . lang('Warnings') . "</a>" . script("qsl('a').onclick = partial(toggle, '$warnings_id');", "");
--- a/adminer/table.inc.php
+++ b/adminer/table.inc.php
@@ -26,7 +26,7 @@ if ($fields) {
 	adminer()->tableStructurePrint($fields, $table_status);
 }

-if (support("indexes") && $driver->supportsIndex($table_status)) {
+if (support("indexes") && driver()->supportsIndex($table_status)) {
 	echo "<h3 id='indexes'>" . lang('Indexes') . "</h3>\n";
 	$indexes = indexes($TABLE);
 	if ($indexes) {
@@ -68,7 +68,7 @@ if (!is_view($table_status)) {

 	if (support("check")) {
 		echo "<h3 id='checks'>" . lang('Checks') . "</h3>\n";
-		$check_constraints = $driver->checkConstraints($TABLE);
+		$check_constraints = driver()->checkConstraints($TABLE);
 		if ($check_constraints) {
 			echo "<table>\n";
 			foreach ($check_constraints as $key => $val) {
--- a/adminer/type.inc.php
+++ b/adminer/type.inc.php
@@ -24,7 +24,7 @@ if (!$row) {
 <p>
 <?php
 if ($TYPE != "") {
-	$types = $driver->types();
+	$types = driver()->types();
 	$enums = type_values($types[$TYPE]);
 	if ($enums) {
 		echo "<code class='jush-" . JUSH . "'>ENUM (" . h($enums) . ")</code>\n<p>";
--- a/editor/include/adminer.inc.php
+++ b/editor/include/adminer.inc.php
@@ -354,7 +354,6 @@ ORDER BY ORDINAL_POSITION", null, "") as $row
 	}

 	function selectSearchProcess($fields, $indexes) {
-		global $driver;
 		$return = array();
 		foreach ((array) $_GET["where"] as $key => $where) {
 			$col = $where["col"];
@@ -370,7 +369,7 @@ ORDER BY ORDINAL_POSITION", null, "") as $row
 						} else {
 							$text_type = preg_match('~char|text|enum|set~', $field["type"]);
 							$value = adminer()->processInput($field, (!$op && $text_type && preg_match('~^[^%]+$~', $val) ? "%$val%" : $val));
-							$conds[] = $driver->convertSearch($name, $where, $field) . ($value == "NULL" ? " IS" . ($op == ">=" ? " NOT" : "") . " $value"
+							$conds[] = driver()->convertSearch($name, $where, $field) . ($value == "NULL" ? " IS" . ($op == ">=" ? " NOT" : "") . " $value"
 								: (in_array($op, adminer()->operators()) || $op == "=" ? " $op $value"
 								: ($text_type ? " LIKE $value"
 								: " IN (" . str_replace(",", "', '", $value) . ")"