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@ 2016-01-11T15:05:37Z

<?php

namespace Foo;

$start = microtime(true);
for ($i=0;$i<10000;$i++) {
    $a = \is_null($i);    
}

var_dump(microtime(true) - $start);

$start = microtime(true);
for ($i=0;$i<10000;$i++) {
    $a = null === $i;    
}

var_dump(microtime(true) - $start);

Output
Performance
VLD
References
Branches

var_dump: documentation ( source)
microtime: documentation ( source)

preferences:dark modelive preview

31.08 ms | 402 KiB | 5 Q