3v4l.org

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; } }
Output for 4.3.0 - 4.3.11, 4.4.0 - 4.4.9, 5.0.0 - 5.0.5, 5.1.0 - 5.1.6, 5.2.0 - 5.2.17, 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.38, 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
123<div style='color: red'>4</div>567<div style='color: red'>8</div>91011<div style='color: red'>12</div>131415<div style='color: red'>16</div>171819<div style='color: red'>20</div>212223<div style='color: red'>24</div>252627<div style='color: red'>28</div>2930
preferences:
275.72 ms | 406 KiB | 461 Q