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<?php $a = "ab"; echo preg_replace("/(a)|(b)/", "+$2+|-$1-");
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ZnT04
function name:  (null)
number of ops:  7
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'ab'
    5     1        INIT_FCALL                                               'preg_replace'
          2        SEND_VAL                                                 '%2F%28a%29%7C%28b%29%2F'
          3        SEND_VAL                                                 '%2B%242%2B%7C-%241-'
          4        DO_ICALL                                         $2      
          5        ECHO                                                     $2
          6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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