3v4l.org

run code in 300+ PHP versions simultaneously
<?php $start = new DateTime('2008-12-31 00:00'); $end = new DateTime('2009-02-01 00:00'); $point = $start; while($point <= $end){ echo $point->format('YW') . "\n"; $point = $point->modify('next week'); }
Output for 5.5.0 - 5.5.37, 5.6.0 - 5.6.23, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.5 - 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 - 8.3.4, 8.3.6
200801 200902 200903 200904 200905
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0 200801 200902 200903 200904 200905
preferences:
235.48 ms | 402 KiB | 247 Q