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@ 2016-05-31T19:19:44Z

<?php

namespace Test;

function callIsNull($arg) {
    return is_null($arg);
}

var_dump(callIsNull(null));

eval('
namespace Test;

function is_null($arg) {
    return false;
}
');

var_dump(callIsNull(null));

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
is_null: documentation ( source)

preferences:dark modelive preview

49.98 ms | 402 KiB | 5 Q