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run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump(preg_match_all('/.\K/', 'abcd'));
Output for 5.6.13 - 7.2.0
int(4)
Output for 5.4.0 - 5.6.12
int(2)
Output for 4.3.4 - 5.3.29
Warning: preg_match_all() expects at least 3 parameters, 2 given in /in/CLj0O on line 2 bool(false)
Output for 4.3.3

Process exited with code 139.
Output for 4.3.0 - 4.3.2
Warning: Wrong parameter count for preg_match_all() in /in/CLj0O on line 2 NULL