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Doc Bug #12905 "return" returns a copy of an object instead of a reference
Submitted: 2001-08-22 12:13 UTC Modified: 2001-08-22 16:19 UTC
From: olli at ukgamer dot net Assigned:
Status: Not a bug Package: Documentation problem
PHP Version: 4.0.6 OS: Slackware 7
Private report: No CVE-ID: None
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From: olli at ukgamer dot net
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 [2001-08-22 12:13 UTC] olli at ukgamer dot net
<?
Class ChildClass {
	var $value;
	
	function ChildClass($value){
		$this->value = $value;
	}
}

Class ParentClass {
	var $children;
	
	function ParentClass(){
		$this->children = array();
	}
	
	function AddChild($value){
		$child = &new ChildClass($value);
		array_push($this->children, &$child);
		return $child;
	}
}


$p1 = &new ParentClass();

$c1 = &$p1->AddChild('set in constructor');
$c1->value = 'set elsewhere';

echo "the reference to the object created in AddBand and stored in the parentclass' array is different to that returned by the AddBand function<br>";
echo $p1->children[0]->value."<br>";
echo $c1->value;

?>

"return" is returning a copy of the object created in parentclass->AddChild instead of a reference. "return &$object" is flagged as invalid by the php interpreter.

thanks a lot
olli holliday

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 [2001-08-22 12:20 UTC] olli at ukgamer dot net
renaming the function:

function AddChild(...

to

function &AddChild(...
makes return return by reference instead of by value, i didnt think to do this so it appears its my fault:)

i've changed this bug to a documentation problem tho cos i cant find any reference to this in the docs.

 [2001-08-22 16:19 UTC] jeroen@php.net
Please read: http://www.php.net/manual/en/language.references.return.php

[By the way, a user complains that is hard to read. If you or anyone else has a better text, simply mail it to phpdoc@lists.php.net, and we'll put it online.]
 
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