3v4l.org

run code in 300+ PHP versions simultaneously
<?php substr_count ('haystack', 'needle', 0, 0);
Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.24, 7.4.0 - 7.4.13, 8.0.0
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33
Warning: substr_count(): Length should be greater than 0 in /in/jcDIo on line 3