Ticket #55522: 55522.patch

.php

@@ -772 +772 @@
 /**
  * Get the filesystem directory path (with trailing slash) for the plugin __FILE__ passed in.
  *
- * @since 2.8.0
+ * @since 5.9.2
  *
- * @param string $file The filename of the plugin (__FILE__).
- * @return string the filesystem path of the directory that contains the plugin.
+ * @param string $file The filename of the plugin (__FILE__). Default empty
+ * @return string the filesystem path of the directory that contains the plugin if a filename is specified. Returns the base plugin directory path otherwise.
  */
-function plugin_dir_path( $file ) {
-        return trailingslashit( dirname( $file ) );
+function plugin_dir_path( $file = '' ) {
+        return trim( $file ) !== ''
+                ? trailingslashit( dirname( $file ) )
+                : trailingslashit( WP_CONTENT_DIR . '/plugins' );
 }
 
 /**
  * Get the URL directory path (with trailing slash) for the plugin __FILE__ passed in.
  *
- * @since 2.8.0
+ * @since 5.9.2
  *
- * @param string $file The filename of the plugin (__FILE__).
- * @return string the URL path of the directory that contains the plugin.
+ * @param string $file The filename of the plugin (__FILE__). Default empty
+ * @return string the filesystem path of the directory that contains the plugin if a filename is specified. Returns the base plugin directory path otherwise.
  */
-function plugin_dir_url( $file ) {
-        return trailingslashit( plugins_url( '', $file ) );
+function plugin_dir_url( $file = '' ) {
+        return trim( $file ) !== ''
+                ? trailingslashit( plugins_url( '', $file ) )
+                : trailingslashit( plugins_url() );
 }
 
 /**