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@ 2014-08-19T13:48:33Z

<?php
$y = 0;
for($i = 0; $i < 100000; $i++){
	$y += $i;
	$x = implode("", array("xxxx", "xxxx", "xxxx","xxxx"));
}

echo $x.$i;

Output
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implode: documentation ( source)

preferences:dark modelive preview

33.92 ms | 402 KiB | 5 Q