3v4l.org

run code in 300+ PHP versions simultaneously
<?php preg_match('/robot|spider|crawler|curl|^$/i', 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_9_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.94 Safari/537.36');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/RWT3X
function name:  (null)
number of ops:  5
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%2Frobot%7Cspider%7Ccrawler%7Ccurl%7C%5E%24%2Fi'
          2        SEND_VAL                                                 'Mozilla%2F5.0+%28Macintosh%3B+Intel+Mac+OS+X+10_9_4%29+AppleWebKit%2F537.36+%28KHTML%2C+like+Gecko%29+Chrome%2F37.0.2062.94+Safari%2F537.36'
          3        DO_ICALL                                                 
          4      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
148.7 ms | 938 KiB | 16 Q