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@ 2015-08-02T17:41:05Z

<?php

class Example {
    private $label;
    public function __construct($label) {
        $this->label = $label;
    }
    public function __sleep() {
        echo "Attempt to serialize object with label $this->label\n";
        return array('label');
    }
    public function __destruct() {
        echo "Refcount reached zero for object with label $this->label\n";
    }
    public function throwSomething($unused_parameter) {
        throw new Exception;
    }
}

echo "-- No object in stack trace --\n";
$target = new Example('Target of method call');
try {
    $target->throwSomething('irrelevant data');
}
catch ( Exception $e ) {
    // Serialize exception, doesn't touch object
    var_dump(serialize($e));
    // Destroy $target, as there are no other references to it
    unset($target);
}

echo "-- No object as argument captured in stack trace --\n";
$target = new Example('Target of method call');
$parameter = new Example('Parameter passed but never actually used');
try {
    $target->throwSomething($parameter);
}
catch ( Exception $e ) {
    // Serialize exception, will attempt to serialize $parameter
    var_dump(serialize($e));
    // Destroy $target, as there are no other references to it
    unset($target);
    // Attempt to do the same for $parameter, Exception holds a reference
    unset($parameter);
}

echo "-- PHP process cleanup begins here --\n";

Output for git.master, git.master_jit, rfc.property-hooks: -- No object in stack trace -- string(383) "O:9:"Exception":7:{s:10:"*message";s:0:"";s:17:"Exceptionstring";s:0:"";s:7:"*code";i:0;s:7:"*file";s:9:"/in/hOYb9";s:7:"*line";i:16;s:16:"Exceptiontrace";a:1:{i:0;a:6:{s:4:"file";s:9:"/in/hOYb9";s:4:"line";i:23;s:8:"function";s:14:"throwSomething";s:5:"class";s:7:"Example";s:4:"type";s:2:"->";s:4:"args";a:1:{i:0;s:15:"irrelevant data";}}}s:19:"Exceptionprevious";N;}" Refcount reached zero for object with label Target of method call -- No object as argument captured in stack trace -- Attempt to serialize object with label Parameter passed but never actually used string(448) "O:9:"Exception":7:{s:10:"*message";s:0:"";s:17:"Exceptionstring";s:0:"";s:7:"*code";i:0;s:7:"*file";s:9:"/in/hOYb9";s:7:"*line";i:16;s:16:"Exceptiontrace";a:1:{i:0;a:6:{s:4:"file";s:9:"/in/hOYb9";s:4:"line";i:36;s:8:"function";s:14:"throwSomething";s:5:"class";s:7:"Example";s:4:"type";s:2:"->";s:4:"args";a:1:{i:0;O:7:"Example":1:{s:14:"Examplelabel";s:40:"Parameter passed but never actually used";}}}}s:19:"Exceptionprevious";N;}" Refcount reached zero for object with label Target of method call -- PHP process cleanup begins here -- Refcount reached zero for object with label Parameter passed but never actually used

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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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