Fix "Trying to access array offset on null" warning

framework/CHANGELOG.md

@@ -21,6 +21,7 @@ Yii Framework 2 Change Log
 - Enh #20279: Add to the `\yii\web\Request` `csrfTokenSafeMethods` property to configure a custom safe HTTP methods list (olegbaturin)
 - Bug #20140: Fix compatibility with PHP 8.4: calling `session_set_save_handler()` (Izumi-kun)
 - New #20185: Add `BackedEnum` support to `AttributeTypecastBehavior` (briedis)
+- Bug #17365: Fix "Trying to access array offset on null" warning (xcopy)
 
 2.0.51 July 18, 2024
 --------------------

framework/caching/FileCache.php

@@ -158,8 +158,14 @@
             return @touch($cacheFile, $duration + time());
         }
 
-        $error = error_get_last();
-        Yii::warning("Unable to write cache file '{$cacheFile}': {$error['message']}", __METHOD__);
+        $message = "Unable to write cache file '{$cacheFile}'";
+
+        if ($error = error_get_last()) {
+            $message .= ": {$error['message']}";
+        }
+
+        Yii::warning($message, __METHOD__);
+
         return false;
     }
 
@@ -265,20 +271,26 @@
                     continue;
                 }
                 $fullPath = $path . DIRECTORY_SEPARATOR . $file;
+                $message = null;
                 if (is_dir($fullPath)) {
                     $this->gcRecursive($fullPath, $expiredOnly);
                     if (!$expiredOnly) {
                         if (!@rmdir($fullPath)) {
-                            $error = error_get_last();
-                            Yii::warning("Unable to remove directory '{$fullPath}': {$error['message']}", __METHOD__);
+                            $message = "Unable to remove directory '$fullPath'";
+                            if ($error = error_get_last()) {
+                                $message .= ": {$error['message']}";
+                            }
                         }
                     }
                 } elseif (!$expiredOnly || $expiredOnly && @filemtime($fullPath) < time()) {
                     if (!@unlink($fullPath)) {
-                        $error = error_get_last();
-                        Yii::warning("Unable to remove file '{$fullPath}': {$error['message']}", __METHOD__);
+                        $message = "Unable to remove file '$fullPath'";
+                        if ($error = error_get_last()) {
+                            $message .= ": {$error['message']}";
+                        }
                     }
                 }
+                $message and Yii::warning($message, __METHOD__);
             }
             closedir($handle);
         }

framework/log/FileTarget.php

@@ -131,8 +131,11 @@
         }
         $writeResult = @fwrite($fp, $text);
         if ($writeResult === false) {
-            $error = error_get_last();
-            throw new LogRuntimeException("Unable to export log through file ({$this->logFile})!: {$error['message']}");
+            $message = "Unable to export log through file ($this->logFile)!";
+            if ($error = error_get_last()) {
+                $message .= ": {$error['message']}";
+            }
+            throw new LogRuntimeException($message);
         }
         $textSize = strlen($text);
         if ($writeResult < $textSize) {