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run code in 300+ PHP versions simultaneously
<?php for($i = 0, $c = 0, $str = "The quick brown fox jumps over the lazy dog."; $i < strlen($str); $i++) { if(in_array(substr($str,$i,1),array("a","e","i","o","u"))) $c++; } echo $c;

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42.88 ms | 402 KiB | 5 Q