diff --git a/adminer/drivers/mysql.inc.php b/adminer/drivers/mysql.inc.php
index 0447e953..9985df17 100644
--- a/adminer/drivers/mysql.inc.php
+++ b/adminer/drivers/mysql.inc.php
@@ -444,7 +444,7 @@ if (!defined('Adminer\DRIVER')) {
 
 	/** Connect to the database
 	* @param array{string, string, string} [$server, $username, $password]
-	* @return mixed Db or string for error
+	* @return string|Db string for error
 	*/
 	function connect($credentials) {
 		global $drivers;
@@ -1073,47 +1073,12 @@ if (!defined('Adminer\DRIVER')) {
 	/** Get approximate number of rows
 	* @param TableStatus
 	* @param list<string>
-	* @return numeric-string|void null if approximate number can't be retrieved
+	* @return numeric-string|null null if approximate number can't be retrieved
 	*/
 	function found_rows($table_status, $where) {
 		return ($where || $table_status["Engine"] != "InnoDB" ? null : $table_status["Rows"]);
 	}
 
-	/* Not used is MySQL but checked in compile.php:
-	/** Get user defined types
-	* @return string[] [$id => $name]
-	function types() {
-		return array();
-	}
-
-	/** Get values of user defined type
-	* @param int
-	* @return string
-	function type_values($id) {
-		return "";
-	}
-
-	/** Get existing schemas
-	* @return list<string>
-	function schemas() {
-		return array();
-	}
-
-	/** Get current schema
-	* @return string
-	function get_schema() {
-		return "";
-	}
-
-	/** Set current schema
-	* @param string
-	* @param Db
-	* @return bool
-	function set_schema($schema, $connection2 = null) {
-		return true;
-	}
-	*/
-
 	/** Get SQL command to create table
 	* @param string
 	* @param bool
@@ -1241,4 +1206,44 @@ if (!defined('Adminer\DRIVER')) {
 	function max_connections() {
 		return get_val("SELECT @@max_connections");
 	}
+
+	// Not used is MySQL but checked in compile.php:
+
+	/** Get user defined types
+	* @return string[] [$id => $name]
+	*/
+	function types() {
+		return array();
+	}
+
+	/** Get values of user defined type
+	* @param int
+	* @return string
+	*/
+	function type_values($id) {
+		return "";
+	}
+
+	/** Get existing schemas
+	* @return list<string>
+	*/
+	function schemas() {
+		return array();
+	}
+
+	/** Get current schema
+	* @return string
+	*/
+	function get_schema() {
+		return "";
+	}
+
+	/** Set current schema
+	* @param string
+	* @param Db
+	* @return bool
+	*/
+	function set_schema($schema, $connection2 = null) {
+		return true;
+	}
 }
diff --git a/adminer/drivers/pgsql.inc.php b/adminer/drivers/pgsql.inc.php
index 82e7166f..490ffdfe 100644
--- a/adminer/drivers/pgsql.inc.php
+++ b/adminer/drivers/pgsql.inc.php
@@ -854,7 +854,7 @@ AND typelem = 0"
 		}
 		$fields = fields($table);
 
-		if (!$status || empty($fields)) {
+		if (count($status) < 2 || empty($fields)) {
 			return false;
 		}
 
diff --git a/adminer/include/auth.inc.php b/adminer/include/auth.inc.php
index ebf3b63f..9a0ff67d 100644
--- a/adminer/include/auth.inc.php
+++ b/adminer/include/auth.inc.php
@@ -61,6 +61,7 @@ function check_invalid_login() {
 			break;
 		}
 	}
+	/** @var array{int, int} */
 	$invalid = idx($invalids, $adminer->bruteForceKey(), array());
 	$next_attempt = ($invalid[1] > 29 ? $invalid[0] - time() : 0); // allow 30 invalid attempts
 	if ($next_attempt > 0) { //! do the same with permanent login
diff --git a/adminer/include/editing.inc.php b/adminer/include/editing.inc.php
index 9981b43b..97a492bc 100644
--- a/adminer/include/editing.inc.php
+++ b/adminer/include/editing.inc.php
@@ -124,7 +124,7 @@ function referencable_primary($self) {
 
 /** Print SQL <textarea> tag
 * @param string
-* @param string or array in which case [0] of every element is used
+* @param string|list<array{string}>
 * @param int
 * @param int
 * @return void
diff --git a/adminer/include/functions.inc.php b/adminer/include/functions.inc.php
index 013b7b30..422027ab 100644
--- a/adminer/include/functions.inc.php
+++ b/adminer/include/functions.inc.php
@@ -174,7 +174,7 @@ function sid() {
 * @param string
 * @param string
 * @param string
-* @param string
+* @param ?string
 * @return void
 */
 function set_password($vendor, $server, $username, $password) {
@@ -185,7 +185,7 @@ function set_password($vendor, $server, $username, $password) {
 }
 
 /** Get password from session
-* @return string or null for missing password or false for expired password
+* @return string|false|null null for missing password, false for expired password
 */
 function get_password() {
 	$return = get_session("pwds");
@@ -549,7 +549,7 @@ class Queries {
 
 /** Execute and remember query
 * @param string end with ';' to use DELIMITER
-* @return Result
+* @return Result|bool
 */
 function queries($query) {
 	global $connection;
@@ -902,7 +902,7 @@ function rand_string() {
 }
 
 /** Format value to use in select
-* @param string
+* @param string|string[]
 * @param string
 * @param Field
 * @param int
@@ -945,7 +945,7 @@ function select_value($val, $link, $field, $text_length) {
 }
 
 /** Check whether the string is e-mail address
-* @param string
+* @param ?string
 * @return bool
 */
 function is_mail($email) {
diff --git a/adminer/select.inc.php b/adminer/select.inc.php
index cb0db3c5..cd305aeb 100644
--- a/adminer/select.inc.php
+++ b/adminer/select.inc.php
@@ -337,6 +337,7 @@ if (!$columns && support("table")) {
 			$rank = 1;
 			foreach ($rows[0] as $key => $val) {
 				if (!isset($unselected[$key])) {
+					/** @var array{fun?:string, col?:string} */
 					$val = idx($_GET["columns"], key($select)) ?: array();
 					$field = $fields[$select ? ($val ? $val["col"] : current($select)) : $key];
 					$name = ($field ? $adminer->fieldName($field, $rank) : ($val["fun"] ? "*" : h($key)));
diff --git a/phpstan.neon b/phpstan.neon
index a3cd2b2c..5902005e 100644
--- a/phpstan.neon
+++ b/phpstan.neon
@@ -1,10 +1,10 @@
 parameters:
-	level: 3
+	level: 4
 	ignoreErrors:
 		# need to fix
 		- "~^Function Adminer\\\\fields_from_edit\\(\\) should return~" # Mongo and SimpleDB
 		- "~^Function Adminer\\\\explain\\(\\) should return Adminer\\\\Result~" # mysqli_result
-
+		
 		# not real problems
 		- identifier: include.fileNotFound # relative includes
 		- identifier: includeOnce.fileNotFound # ./adminer-plugins.php
@@ -12,10 +12,25 @@ parameters:
 		- "~^Function (foreign_keys_sql|recreate_table) not found~" # defined by other drivers
 		- "~^Variable \\$(adminer|connection|driver|drivers|error|HTTPS|LANG|langs|permanent|has_token|token|translations|VERSION) might not be defined~" # declared in bootstrap.inc.php
 		- "~^Method Adminer\\\\Plugins::\\w+\\(\\) with return type void~" # we use the same pattern for all methods
-		- "~OCI-?Lob~" # maybe include stub?
+		- "~Call to function is_object\\(\\) with Adminer\\\\Db\\|string will always evaluate to false~" # is_object(Db) is true
+		- "~^Comparison operation \"==\" between \\(array\\|float\\|int\\) and 1~" # it thinks that $affected could be an array
 
 		# it probably doesn't like $ar[$key] instead of isset($ar[$key]) and thinks that $ar[$key] is always set
-		- "~^Comparison operation \"==\" between \\(array\\|float\\|int\\) and 1~"
+		- identifier: identical.alwaysFalse
+		- identifier: notEqual.alwaysFalse
+		- identifier: notIdentical.alwaysTrue
+		- identifier: booleanNot.alwaysFalse
+		- identifier: booleanAnd.alwaysFalse
+		- identifier: booleanAnd.leftAlwaysTrue
+		- identifier: booleanAnd.rightAlwaysTrue
+		- identifier: booleanAnd.rightAlwaysFalse
+		- identifier: booleanOr.alwaysTrue
+		- identifier: booleanOr.leftAlwaysTrue
+		- identifier: ternary.alwaysTrue
+		- identifier: if.alwaysTrue
+		- identifier: while.alwaysTrue
+		- identifier: isset.offset
+		- identifier: deadCode.unreachable
 
 	paths:
 		- adminer/
@@ -28,14 +43,14 @@ parameters:
 		- adminer/drivers/oracle.inc.php
 		- adminer/drivers/pgsql.inc.php
 		- adminer/drivers/sqlite.inc.php
-
+	
 	phpVersion:
 		min: 70100
 		max: 80499
 	checkMissingCallableSignature: true
 	typeAliases:
-		TableStatus: "array{Name:string, Engine?:?string, Comment?:string, Oid?:numeric-string, Rows?:numeric-string, Collation?:string, Auto_increment?:numeric-string, Data_length?:numeric-string, Index_length?:numeric-string, Data_free?:numeric-string, Create_options?:string, nspname?:string}"
-		Field: "array{field:string, full_type:string, type:string, length:numeric-string, unsigned:string, default:?string, null:bool, auto_increment:bool, on_update:string, collation:string, privileges:int[], comment:string, primary:bool, generated:string, orig?:string, on_delete?:string, inout?:string}"
+		TableStatus: "array{Name:string, Engine?:?string, Comment?:string, Oid?:numeric-string, Rows?:?numeric-string, Collation?:string, Auto_increment?:?numeric-string, Data_length?:numeric-string, Index_length?:numeric-string, Data_free?:numeric-string, Create_options?:string, nspname?:string}"
+		Field: "array{field:?string, full_type:string, type:string, length:numeric-string, unsigned:string, default:?string, null:bool, auto_increment:bool, collation:string, privileges:int[], comment:string, primary:bool, generated:string, orig?:string, on_update:?string, on_delete?:string, inout?:string}"
 		Index: "array{type:string, columns:list<string>, lengths:list<numeric-string>, descs:list<?bool>}"
 		ForeignKey: "array{db:string, ns?:string, table:string, source:list<string>, target:list<string>, on_delete:string, on_update:string}"
 		Trigger: "array{Trigger?:string, Timing?:string, Event?:string, Of?:string, Type?:string, Statement?:string}"