3v4l.org

run code in 300+ PHP versions simultaneously
<?php echo mktime(0,0,0, 1, 0) . '<br/>'; echo mktime(0,0,0, 12, 31) . '<br/>';
Output for 5.6.28, 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.31, 7.4.0 - 7.4.33, 8.0.0 - 8.0.12, 8.0.14 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
1419980400<br/>1451516400<br/>
Output for 7.3.32 - 7.3.33, 8.0.13
1419984000<br/>1451520000<br/>
Output for 5.5.24 - 5.5.35, 5.6.8 - 5.6.21, 7.0.0 - 7.0.6
1451516400<br/>1483138800<br/>
preferences:
181.02 ms | 402 KiB | 230 Q