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Request #50296 Automatically translate "self" in method_exists
Submitted: 2009-11-25 17:24 UTC Modified: 2021-02-18 11:33 UTC
Avg. Score:3.0 ± 2.0
Reproduced:0 of 1 (0.0%)
From: soapergem at gmail dot com Assigned:
Status: Wont fix Package: Scripting Engine problem
PHP Version: 5.3.1 OS: Windows XP
Private report: No CVE-ID: None
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 [2009-11-25 17:24 UTC] soapergem at gmail dot com
In reference to bug #50289:

If I call method_exists("self", "method") from within a class, it 
should automatically translate "self" to the classname. Right now the 
behavior is not obvious; the behavior does not adhere to the KISS 

1. method_exists already can check for static methods.
2. "self" can already automatically translate to the current class 
name, for instance in call_user_func.
3. The most logical, simple and obvious expectation is that if you 
combine these two--you call method_exists with "self"--that it will 
automatically translate "self" to the current class name, and check 
for the method. Currently it does not. The current behavior is 
counterintuitive and confusing.

Making this change is not dangerous. Making this change will not cause 
any backwards-compatibility issues.

1. "self" is a reserved word. You cannot declare a class named "self"-
-this will issue a fatal error. So there is no possibility of any 
ambiguity. You cannot confuse "self" with any other class, because no 
other class can be named "self".

It does not make sense to have "self" work in some contexts but not in 
others. It would be better if it were consistent.

Reproduce code:
class Test
    public static function check()
        var_dump(method_exists("self", "method"));
    public static function method() { }

Expected result:

Actual result:


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 [2010-12-01 16:29 UTC]
-Package: Feature/Change Request +Package: Scripting Engine problem
 [2011-01-12 20:04 UTC] m dot grundner at delegate dot at
Why don't you use method_exists(__CLASS__, "method")?
 [2021-02-18 11:33 UTC]
-Status: Open +Status: Wont fix
 [2021-02-18 11:33 UTC]
Support for self/parent/static in callables is nowadays considered to have been a mistake, as it makes them context-dependent. I think I can safely say that this will not be supported for method_exists(). I think that (with the exception of callables) PHP fairly consistenty rejects "self" etc for dynamic class names.

The class name can be obtained using self::class, or __CLASS__.
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