PHPStan: Fix level 0 errors

adminer/drivers/mysql.inc.php

@@ -1184,7 +1184,7 @@ if (!defined('Adminer\DRIVER')) {
 
 	/** Convert field in select and edit
 	* @param Field one element from fields()
-	* @return string
+	* @return ?string
 	*/
 	function convert_field($field) {
 		if (preg_match("~binary~", $field["type"])) {

adminer/drivers/pgsql.inc.php

@@ -176,9 +176,7 @@ if (isset($_GET["pgsql"])) {
 				return $return;
 			}
 
-			function warnings() {
-				return ''; // not implemented in PDO_PgSQL as of PHP 7.2.1
-			}
+			// warnings() not implemented in PDO_PgSQL as of PHP 7.2.1
 
 			function close() {
 			}

adminer/include/adminer.inc.php

@@ -22,7 +22,7 @@ class Adminer {
 	}
 
 	/** Get SSL connection options
-	* @return string[] or null
+	* @return ?string[]
 	*/
 	function connectSsl() {
 	}
@@ -289,7 +289,7 @@ class Adminer {
 	/** Get a link to use in select table
 	* @param string raw value of the field
 	* @param Field single field returned from fields()
-	* @return string or null to create the default link
+	* @return ?string null to create the default link
 	*/
 	function selectLink($val, $field) {
 	}

adminer/include/driver.inc.php

@@ -61,14 +61,14 @@ abstract class SqlDriver {
 
 	/** Get enum values
 	* @param Field
-	* @return string or null
+	* @return ?string
 	*/
 	function enumLength($field) {
 	}
 
 	/** Function used to convert the value inputted by user
 	* @param Field
-	* @return string or null
+	* @return ?string
 	*/
 	function unconvertFunction($field) {
 	}
@@ -187,7 +187,7 @@ abstract class SqlDriver {
 	/** Return query with a timeout
 	* @param string
 	* @param int seconds
-	* @return string or null if the driver doesn't support query timeouts
+	* @return ?string null if the driver doesn't support query timeouts
 	*/
 	function slowQuery($query, $timeout) {
 	}
@@ -231,16 +231,15 @@ abstract class SqlDriver {
 	}
 
 	/** Get warnings about the last command
-	* @return string HTML
+	* @return ?string HTML
 	*/
 	function warnings() {
-		return '';
 	}
 
 	/** Get help link for table
 	* @param string
 	* @param bool
-	* @return string relative URL or null
+	* @return ?string relative URL
 	*/
 	function tableHelp($name, $is_view = false) {
 	}

adminer/include/editing.inc.php

@@ -299,7 +299,7 @@ function default_value($field) {
 
 /** Get type class to use in CSS
 * @param string
-* @return string class=''
+* @return ?string class=''
 */
 function type_class($type) {
 	foreach (

adminer/include/functions.inc.php

@@ -66,8 +66,8 @@ function escape_string($val) {
 }
 
 /** Get a possibly missing item from a possibly missing array
-* idx($row, $key) is better than $row[$key] ?? null because it reports error for undefined $row
-* @param array|null
+* idx($row, $key) is better than $row[$key] ?? null because PHP will report error for undefined $row
+* @param ?array
 * @param string|int
 * @param mixed
 * @return mixed
@@ -274,7 +274,7 @@ function get_rows($query, $connection2 = null, $error = "<p class='error'>") {
 /** Find unique identifier of a row
 * @param string[]
 * @param Index[] result of indexes()
-* @return string[] or null if there is no unique identifier
+* @return ?string[] null if there is no unique identifier
 */
 function unique_array($row, $indexes) {
 	foreach ($indexes as $index) {
@@ -377,11 +377,11 @@ function convert_fields($columns, $fields, $select = array()) {
 * @param string
 * @param string
 * @param int number of seconds, 0 for session cookie, 2592000 - 30 days
-* @return bool
+* @return null
 */
 function cookie($name, $value, $lifetime = 2592000) {
 	global $HTTPS;
-	return header(
+	header(
 		"Set-Cookie: $name=" . urlencode($value)
 			. ($lifetime ? "; expires=" . gmdate("D, d M Y H:i:s", time() + $lifetime) . " GMT" : "")
 			. "; path=" . preg_replace('~\?.*~', '', $_SERVER["REQUEST_URI"])
@@ -413,10 +413,10 @@ function get_setting($key, $cookie = "adminer_settings") {
 /** Store settings to a cookie
 * @param mixed[]
 * @param string
-* @return bool
+* @return null
 */
 function save_settings($settings, $cookie = "adminer_settings") {
-	return cookie($cookie, http_build_query($settings + get_settings($cookie)));
+	cookie($cookie, http_build_query($settings + get_settings($cookie)));
 }
 
 /** Restart stopped session
@@ -495,7 +495,7 @@ function is_ajax() {
 /** Send Location header and exit
 * @param string null to only set a message
 * @param string
-* @return never
+* @return null
 */
 function redirect($location, $message = null) {
 	if ($message !== null) {

phpstan.neon

@@ -0,0 +1,13 @@
+parameters:
+	level: 0
+	ignoreErrors:
+		- identifier: include.fileNotFound # relative includes
+		- identifier: includeOnce.fileNotFound # ./adminer-plugins.php
+		- "~^Function (set_magic_quotes_runtime|mysql_)~" # PHP < 7 functions
+		- "~^Instantiated class Adminer\\w~" # no support for classes defined inside function
+	paths:
+		- .
+	phpVersion:
+		min: 70100
+		max: 80499
+	checkMissingCallableSignature: true

plugins/drivers/firebird.php

@@ -27,8 +27,8 @@ if (isset($_GET["firebird"])) {
 				$this->_link = ibase_connect($server, $username, $password);
 				if ($this->_link) {
 					$url_parts = explode(':', $server);
-					$this->service_link = ibase_service_attach($url_parts[0], $username, $password);
-					$this->server_info = ibase_server_info($this->service_link, IBASE_SVC_SERVER_VERSION);
+					$service_link = ibase_service_attach($url_parts[0], $username, $password);
+					$this->server_info = ibase_server_info($service_link, IBASE_SVC_SERVER_VERSION);
 				} else {
 					$this->errno = ibase_errcode();
 					$this->error = ibase_errmsg();

plugins/drivers/imap.php

@@ -110,7 +110,7 @@ if (isset($_GET["imap"])) {
 			}
 
 			function expunge() {
-				return imap_expunge();
+				return imap_expunge($this->imap);
 			}
 		}
 
@@ -272,7 +272,7 @@ if (isset($_GET["imap"])) {
 	}
 
 	function truncate_tables($tables) {
-		return connection()->expunge($name);
+		return connection()->expunge();
 	}
 
 	function connect($credentials) {

plugins/drivers/mongo.php

@@ -19,7 +19,7 @@ if (isset($_GET["mongo"])) {
 			}
 
 			function executeCommand($command) {
-				return $this->executeDbCommand($this->_db_name);
+				return $this->executeDbCommand($this->_db_name, $command);
 			}
 
 			function executeDbCommand($db, $command) {