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<?php namespace { function callable_equals(callable ...$callables){ $normalizeCallable = function(callable $callable){ if(is_string($callable)){ $callable = strtolower($callable); $pieces = explode("::", $callable); if(count($pieces) == 2){ return [$pieces[0], $pieces[1]]; } return $callable; } if(is_string($callable[0])){ $callable[0] = strtolower($callable[0]); } $callable[1] = strtolower($callable[1]); return $callable; }; foreach($callables as $i => $callable) $callables[$i] = $normalizeCallable($callable); var_dump($a, $b); return $a === $b; } class Foo{static function bar(){}} } namespace A\b\C\d { class Foo{static function bar(){}} } namespace { var_dump(callable_equals( ['Foo', 'bar'], 'foo::BAR' )); var_dump(callable_equals( ['A\\b\\C\\d\\Foo', 'bAr'], 'a\\B\\c\\D\\FoO::bar' )); }
Output for 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.4, 8.3.6
Warning: Undefined variable $a in /in/n6Nct on line 25 Warning: Undefined variable $b in /in/n6Nct on line 25 NULL NULL Warning: Undefined variable $a in /in/n6Nct on line 26 Warning: Undefined variable $b in /in/n6Nct on line 26 bool(true) Warning: Undefined variable $a in /in/n6Nct on line 25 Warning: Undefined variable $b in /in/n6Nct on line 25 NULL NULL Warning: Undefined variable $a in /in/n6Nct on line 26 Warning: Undefined variable $b in /in/n6Nct on line 26 bool(true)
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 Warning: Undefined variable $a in /in/n6Nct on line 25 Warning: Undefined variable $b in /in/n6Nct on line 25 NULL NULL Warning: Undefined variable $a in /in/n6Nct on line 26 Warning: Undefined variable $b in /in/n6Nct on line 26 bool(true) Warning: Undefined variable $a in /in/n6Nct on line 25 Warning: Undefined variable $b in /in/n6Nct on line 25 NULL NULL Warning: Undefined variable $a in /in/n6Nct on line 26 Warning: Undefined variable $b in /in/n6Nct on line 26 bool(true)
Output for 7.0.0 - 7.0.14, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33
Notice: Undefined variable: a in /in/n6Nct on line 25 Notice: Undefined variable: b in /in/n6Nct on line 25 NULL NULL Notice: Undefined variable: a in /in/n6Nct on line 26 Notice: Undefined variable: b in /in/n6Nct on line 26 bool(true) Notice: Undefined variable: a in /in/n6Nct on line 25 Notice: Undefined variable: b in /in/n6Nct on line 25 NULL NULL Notice: Undefined variable: a in /in/n6Nct on line 26 Notice: Undefined variable: b in /in/n6Nct on line 26 bool(true)
Output for 7.3.32 - 7.3.33
NULL NULL bool(true) NULL NULL bool(true)
Output for 7.0.20

Process exited with code 137.
Output for 5.6.8 - 5.6.28
Notice: Undefined variable: a in /in/n6Nct on line 25 Notice: Undefined variable: b in /in/n6Nct on line 25 NULL NULL Notice: Undefined variable: b in /in/n6Nct on line 26 Notice: Undefined variable: a in /in/n6Nct on line 26 bool(true) Notice: Undefined variable: a in /in/n6Nct on line 25 Notice: Undefined variable: b in /in/n6Nct on line 25 NULL NULL Notice: Undefined variable: b in /in/n6Nct on line 26 Notice: Undefined variable: a in /in/n6Nct on line 26 bool(true)
Output for 5.4.0 - 5.4.45, 5.5.24 - 5.5.35
Parse error: syntax error, unexpected '.', expecting '&' or variable (T_VARIABLE) in /in/n6Nct on line 4
Process exited with code 255.
Output for 5.3.0 - 5.3.29
Parse error: syntax error, unexpected '.', expecting '&' or T_VARIABLE in /in/n6Nct on line 4
Process exited with code 255.
Output for 4.4.2 - 4.4.9, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17
Parse error: syntax error, unexpected '{' in /in/n6Nct on line 3
Process exited with code 255.
Output for 4.3.0 - 4.3.1, 4.3.5 - 4.3.11, 4.4.0 - 4.4.1, 5.0.0 - 5.0.5
Parse error: parse error, unexpected '{' in /in/n6Nct on line 3
Process exited with code 255.
Output for 4.3.2 - 4.3.4
Parse error: parse error in /in/n6Nct on line 3
Process exited with code 255.
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