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@ 2014-08-19T13:47:38Z

<?php
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

48.51 ms | 406 KiB | 6 Q