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Bug #67620 is_callable and self
Submitted: 2014-07-15 08:35 UTC Modified: 2021-10-20 13:14 UTC
Votes:2
Avg. Score:4.0 ± 1.0
Reproduced:2 of 2 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: remyfox at hotmail dot com Assigned: cmb (profile)
Status: Wont fix Package: Scripting Engine problem
PHP Version: 5.4Git-2014-07-15 (Git) OS: windows 7
Private report: No CVE-ID: None
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 [2014-07-15 08:35 UTC] remyfox at hotmail dot com 
Description:
------------
PHP 5.4.7

When "self" is provided to is_callable, while inside a class that doesn't contain the method nor has a parent with the method, it will behave as $this.

Subsequent calling of the method which had been falsely declared callable, will result in 

Fatal error: Call to undefined method A::y() in *__FILE__* on line 5

Test script:
---------------
<?php
	class A {
		public function x() {
			if (is_callable(array($this, "y"))) $this::y();
			if (is_callable(array("self", "y"))) self::y();
		}
	}
	
	class B extends A {
		public function y() {}
	}
	
	(new B())->x();
?>

Expected result:
----------------
Self should behalve like __CLASS__ in the example above and the fatal error should be avoided.

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 [2016-01-15 13:08 UTC] danack@php.net
-Assigned To: +Assigned To: danack
 [2016-01-15 13:08 UTC] danack@php.net 
Assigning to myself. This will require an RFC to change.

https://wiki.php.net/rfc/consistent_callables
 [2021-10-20 13:14 UTC] cmb@php.net
-Status: Assigned +Status: Wont fix -Package: Unknown/Other Function +Package: Scripting Engine problem -Assigned To: danack +Assigned To: cmb
 [2021-10-20 13:14 UTC] cmb@php.net 
Use self::class instead of "self"[1].  Also note that there is an
RFC in voting which proposes to deprecate this callable syntax[2],
and it is highly likely that it will pass, so I'm closing this
ticket as WONTFIX.

Also note that that self is sloppy here, and that it should be
static instead.  Then, as of PHP 8.1.0, you can use the first
class callable syntax[3].

[1] <https://3v4l.org/U6KEk>
[2] <https://wiki.php.net/rfc/deprecate_partially_supported_callables>
[3] <https://3v4l.org/QnPHB>
 
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