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run code in 150+ php & hhvm versions
Bugs & Features
<?php $string = 'bananna'; var_dump(preg_match_all('#(a)#', $string));
Output for 5.4.0 - 7.1.0
int(3)
Output for 4.3.4 - 5.3.29
Warning: preg_match_all() expects at least 3 parameters, 2 given in /in/WXjTB on line 3 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/WXjTB on line 3 NULL