3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php // Positive numbers: $a=substr("tag1,tag10,tag11,tag13,tag15,tag17,tag19,tag20,tag4,tag9,tag8,tag7,tag6,tag5,tag3,tag2,tag18,tag16,tag14,tag12",0,4); echo $a; echo preg_replace("/tag/","",substr("tag1,tag10,tag11,tag13,tag15,tag17,tag19,tag20,tag4,tag9,tag8,tag7,tag6,tag5,tag3,tag2,tag18",4)); ?>
Output for 4.3.0 - 7.2.0
tag1,10,11,13,15,17,19,20,4,9,8,7,6,5,3,2,18