Ticket #18391: 18391.2.diff

src/wp-includes/load.php

@@ -325 +325 @@
                 elseif ( null !== WP_DEBUG_DISPLAY )
                         ini_set( 'display_errors', 0 );
 
-                if ( WP_DEBUG_LOG ) {
+                if ( in_array( WP_DEBUG_LOG, array( true, 'true', 'TRUE', 1, '1' ), true ) ) {
+                        $log_path = WP_CONTENT_DIR . '/debug.log';
+                } elseif ( is_string( WP_DEBUG_LOG ) && 0 === validate_file( WP_DEBUG_LOG ) ) {
+                        $log_path = WP_DEBUG_LOG;
+                } else {
+                        $log_path = false;
+                }
+
+                if ( false !== $log_path && is_writeable( $log_path ) ) {
                         ini_set( 'log_errors', 1 );
-                        ini_set( 'error_log', WP_CONTENT_DIR . '/debug.log' );
+                        ini_set( 'error_log', $log_path );
                 }
         } else {
                 error_reporting( E_CORE_ERROR | E_CORE_WARNING | E_COMPILE_ERROR | E_ERROR | E_WARNING | E_PARSE | E_USER_ERROR | E_USER_WARNING | E_RECOVERABLE_ERROR );