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@ 2013-03-23T10:38:22Z

<?php
function doFoo(){ echo 'hi!'; }

$callable = 'doFoo';

var_dump( is_callable( $callable ) );
var_dump( is_string( $callable ) );

function doBar( callable $cb ){
    $callable();
}

doBar();

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_callable: documentation ( source)

preferences:dark modelive preview

46.99 ms | 402 KiB | 5 Q