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@ 2025-11-07T19:02:43Z

<?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) {
         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 git.master_jit, git.master: unsetting $lock... lock: object(Lock)#2 (0) { } Fatal error: Uncaught DummyFileHandlerException: Uh oh! in /in/KJaL1:15 Stack trace: #0 /in/KJaL1(26): DummyFileHandler->readAll() #1 /in/KJaL1(27): {closure:process_file():25}(Object(Lock)) #2 /in/KJaL1(44): process_file('/some/file.txt') #3 {main} Next Exception: Processing failed in /in/KJaL1:38 Stack trace: #0 /in/KJaL1(44): process_file('/some/file.txt') #1 {main} thrown in /in/KJaL1 on line 38 ***lock released now***
Process exited with code 255.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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