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@ 2013-08-01T15:32:48Z

<?php

function foo(){
   echo 'foo 1';
}


if (is_callable('foo')){
     runkit_function_redefine('foo','','echo "foo 2";');
}

foo();

Output
Performance
VLD
References
Branches

is_callable: documentation ( source)

preferences:dark modelive preview

54.73 ms | 402 KiB | 5 Q