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@ 2014-01-16T14:29:57Z

<?php
$str1="the cat is on the roof"; 
$str2="the mouse is on the roof";
$array_1 = explode(" ", $str1);
$array_2 = explode(" ", $str2);
echo count(array_diff($array_1, $array_2));

Output
Performance
VLD
References
Branches

explode: documentation ( source)
array_diff: documentation ( source)

preferences:dark modelive preview

40.91 ms | 402 KiB | 5 Q