<?php
 
namespace Potherca\Example\TypeHints;
 
class Example
{
    public static function typeHintMissing($subject)
    {
        return $subject;
    }
 
    public static function typeHintCallable(callable $subject)
    {
        return $subject;
    }
 
    public static function typeHintClosure(\Closure $subject)
    {
        return $subject;
    }
 
    public function __invoke($subject)
    {
        return $subject;
    }
}
 
$output = <<<'TXT'
 
================================================================================
(%d) %s :  %s
 
    callable : %s
    __invoke : %s
    closure  : %s 
 
TXT;
 
$example = new Example();
 
$callables = array(
    1 => 'foo',
    2 => 'trim',
    3 => '\Potherca\Example\TypeHints\Example::typeHintMissing',
    4 => array('\Potherca\Example\TypeHints\Example', 'typeHintMissing'),
    5 => array($example, 'typeHintMissing'),
    6 => $example,
    7 => function ($subject) {return $subject;},
);
 
array_walk($callables, function ($callable, $key) use ($output) {
 
    $is_callable = is_callable($callable);
    $is_invoke = method_exists($callable, '__invoke');
    $is_closure = $callable instanceof \Closure;
 
    if ($is_callable === true) {
        /** @noinspection VariableFunctionsUsageInspection */
        call_user_func($callable, 'foo');
        Example::typeHintCallable($callable);
    }
 
    if ($is_closure === true) {
        Example::typeHintClosure($callable);
    }
 
    if ($is_invoke === true) {
        $callable('foo');
    }
 
    vprintf($output, array(
        'key' => $key,
        'type' => gettype($callable),
        'value' => str_replace(array("\n", '  '), '', var_export($callable, true)),
        'is_callable' => var_export($is_callable, true),
        'is_invoke' => var_export($is_invoke, true),
        'is_closure' => var_export($is_closure, true),
    ));
});
 

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