3v4l.org

run code in 300+ PHP versions simultaneously
<?php strtotime( "next monday" ); strtotime( "previous monday" ); strtotime( "today" ); strtotime( "next friday" ); strtotime( "previous friday" );
Output for 5.3.0 - 5.3.29, 5.4.0 - 5.4.45, 5.5.0 - 5.5.37, 5.6.0 - 5.6.28, 7.0.0 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.2 - 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 - 8.3.6
preferences:
205.88 ms | 405 KiB | 299 Q