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Bug #62547 callback of private function in parent class works but static vars are lost
Submitted: 2012-07-13 12:01 UTC Modified: 2020-10-07 12:54 UTC
Avg. Score:3.0 ± 0.0
Reproduced:3 of 3 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: beat at joomlapolis dot com Assigned: cmb (profile)
Status: Closed Package: Class/Object related
PHP Version: 5.3.14 OS: osX 10.6.8
Private report: No CVE-ID: None
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From: beat at joomlapolis dot com
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 [2012-07-13 12:01 UTC] beat at joomlapolis dot com
In the case below where the callback function is private, its static local 
variable is lost during call of inherited class,

t if the callback function is private as below, it still gets called, but the 
local static variable is null instead of initialized like in PHP 5.2, where it 

Also if you make the callback function "protected" instead of "private", the 
result is correct, as expected.

This is reproducible at least on PHP 5.3.8.

Test script:
class ok {
	public function t() {
		$this->replacer( '*' );
		return preg_replace_callback( '/(t)/', array( $this, 'replacer'), 'this is a simple test' );
	private function replacer( $input ) {
		static $cache					=	'-';
		if ( ! is_array( $input ) ) {
			$cache						=	$input;
		} else {
			return $cache . $input[1] . $cache;
class buggyphp extends ok {}

class buggyphptoo extends ok {
	public function t() {
		return parent::t();

$buggy = new buggyphp();
echo 'Result buggyphp: ' . $buggy->t();
echo "\n";
$buggy = new buggyphptoo();
echo 'Result buggyphptoo: ' . $buggy->t();
echo "\n";
$a = new ok();
echo 'Result ok: ' . $a->t();

Expected result:
Result buggyphp: *t*his is a simple *t*es*t*
Result buggyphptoo: *t*his is a simple *t*es*t*
Result ok: *t*his is a simple *t*es*t*

Actual result:
Result buggyphp: -t-his is a simple -t-es-t-
Result buggyphptoo: -t-his is a simple -t-es-t-
Result ok: *t*his is a simple *t*es*t*


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AllCommentsChangesGit/SVN commitsRelated reports
 [2015-08-28 11:50 UTC]
-Status: Open +Status: Verified
 [2015-08-28 11:50 UTC]
Still present: HHVM does this right.
 [2020-10-07 12:54 UTC]
-Status: Verified +Status: Closed -Assigned To: +Assigned To: cmb
 [2020-10-07 12:54 UTC]
Fixed as of PHP 7.4.0.
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Last updated: Wed Oct 20 10:03:33 2021 UTC