Online PHP editor | output for tL5Yt

@ 2025-11-09T17:01:19Z

<?php


class Lock { 
    function __destruct() {
        echo "***lock released now***\n";
    }
}

class DummyFileHandler {
    function lock(string $lock_type): Lock { 
        return new Lock; 
    }
    function readAll() { 
        throw new DummyFileHandlerException('Uh oh!'); 
    }
}

class DummyFileHandlerException extends Exception { };

function process_file(string $path): string {
  try {
    $file = new DummyFileHandler($path);
    $lock = $file->lock('shared');
    $content = (function (Lock $lock) use ($file) {
        $local_lock = $lock; unset($lock);
        return $file->readAll();
    })($lock);
  } catch (DummyFileHandlerException $e) {
    // release $file and $lock
    echo "unsetting \$lock...\n";
    unset($file, $lock);
    
    // but $lock is in fact not yet released, it can be retrieved through the stack trace
    echo "lock: ";
    var_dump($e->getTrace()[1]['args'][0]);
 

    throw new Exception('Processing failed', previous: $e);
  }
 
  return $content;
}

process_file('/some/file.txt');

Output for 8.4.1 - 8.4.15, 8.5.0: unsetting $lock... ***lock released now*** lock: NULL Fatal error: Uncaught DummyFileHandlerException: Uh oh! in /in/tL5Yt:15 Stack trace: #0 /in/tL5Yt(27): DummyFileHandler->readAll() #1 /in/tL5Yt(28): {closure:process_file():25}(NULL) #2 /in/tL5Yt(45): process_file('/some/file.txt') #3 {main} Next Exception: Processing failed in /in/tL5Yt:39 Stack trace: #0 /in/tL5Yt(45): process_file('/some/file.txt') #1 {main} thrown in /in/tL5Yt on line 39
Process exited with code 255.
Output for 8.2.0 - 8.2.29, 8.3.0 - 8.3.28: unsetting $lock... ***lock released now*** lock: NULL Fatal error: Uncaught DummyFileHandlerException: Uh oh! in /in/tL5Yt:15 Stack trace: #0 /in/tL5Yt(27): DummyFileHandler->readAll() #1 /in/tL5Yt(28): {closure}(NULL) #2 /in/tL5Yt(45): process_file('/some/file.txt') #3 {main} Next Exception: Processing failed in /in/tL5Yt:39 Stack trace: #0 /in/tL5Yt(45): process_file('/some/file.txt') #1 {main} thrown in /in/tL5Yt on line 39
Process exited with code 255.

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