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run code in 300+ PHP versions simultaneously
<?php $date = mktime(0, 0, 0, 4, 1, 2013); $days = date("t", $date); for ($i = 1; $i <= $days; $i++) { if(i % 4 == 0){ echo "<div style='color: red'>" . $i . "</div>"; } else{ echo $i; } }

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57.63 ms | 402 KiB | 5 Q