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<?php $regex = "/^-?[0-9]+$/"; $number = 0; var_dump(preg_match_all($regex, $number));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/vXblk
function name:  (null)
number of ops:  10
compiled vars:  !0 = $regex, !1 = $number
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%2F%5E-%3F%5B0-9%5D%2B%24%2F'
    3     1        ASSIGN                                                   !1, 0
    5     2        INIT_FCALL                                               'var_dump'
          3        INIT_FCALL                                               'preg_match_all'
          4        SEND_VAR                                                 !0
          5        SEND_VAR                                                 !1
          6        DO_ICALL                                         $4      
          7        SEND_VAR                                                 $4
          8        DO_ICALL                                                 
          9      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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