PHPStan: Fix level 0 errors

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) {