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@ 2013-04-02T05:13:17Z

<?php
$foo = 'bar';

$t = microtime(true);
for ($i=0; $i<10000000; $i++) {
    is_null($foo);
}
var_dump(microtime(true) - $t);

$t = microtime(true);
for ($i=0; $i<10000000; $i++) {
    $foo === null;
}
var_dump(microtime(true) - $t);

Output
Performance
VLD
References
Branches

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

preferences:dark modelive preview

28.72 ms | 402 KiB | 5 Q