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@ 2015-04-26T00:33:43Z

<?php
namespace
{
    function callable_equals(){

        $strict = false;
        $callables = func_get_args();

        if(is_bool($callables[count($callables) - 1])){
            $strict = $callables[count($callables) - 1];
            $callables = array_splice($callables, 0, -1);
        }

        $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;
        };

        if(count($callables) < 2){
            trigger_error("callable_equals() requires at least 2 callables for comparison.", E_USER_WARNING);
            return null;
        }
        
        foreach($callables as $i => $callable){
            if(!is_callable($callable)){
                trigger_error("Argument " . ($i + 1) . " is not a callable.", E_USER_WARNING);
                return null;
            }else{
                $callables[$i] = $normalizeCallable($callable);
            }
        }

        $callable = array_shift($callables);
        while($callables){
            if($callable !== $callables[0])
                return false;
        }
        return true;
    }
    
    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 git.master, git.master_jit, rfc.property-hooks: Process exited with code 137.

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2020-03-21 RFC: Is_Literal - declined
2020-12-04 Enumerations - included in PHP 8.1
2018-06-15 Typed Properties v2 - implemented in PHP 7.4
2016-08-12 Object typehint - included in PHP 7.2
2016-08-14 Arrow functions - withdrawn
2016-05-29 array_change_keys() - withdrawn
2016-04-19 Lexical scope support for anonymous classes - suspended
2016-04-17 Functional Interfaces - declined
2016-03-16 Typed Properties - superseded in favor of Typed Properties 2.0
2015-08-27 Callable Prototypes - declined
2015-05-01 Short Closures - declined / withdrawn in favor of Arrow Functions
2015-02-18 Scalar type hints v5 - included in PHP 7
2015-02-14 Union Types - declined
2013-09-22 Anonymous classes - included in PHP 7

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