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<?php $date = "4/23/15"; preg_match('~^' . implode('|', range(1, 12)) . '\/' . implode('|', range(1, 31)) . '\/[0-9]{2}$~', $date, $m); var_dump($m);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/n0SPd
function name:  (null)
number of ops:  30
compiled vars:  !0 = $date, !1 = $m
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '4%2F23%2F15'
    4     1        INIT_FCALL                                               'preg_match'
          2        INIT_FCALL                                               'implode'
          3        SEND_VAL                                                 '%7C'
          4        INIT_FCALL                                               'range'
          5        SEND_VAL                                                 1
          6        SEND_VAL                                                 12
          7        DO_ICALL                                         $3      
          8        SEND_VAR                                                 $3
          9        DO_ICALL                                         $4      
         10        CONCAT                                           ~5      '%7E%5E', $4
         11        CONCAT                                           ~6      ~5, '%5C%2F'
         12        INIT_FCALL                                               'implode'
         13        SEND_VAL                                                 '%7C'
         14        INIT_FCALL                                               'range'
         15        SEND_VAL                                                 1
         16        SEND_VAL                                                 31
         17        DO_ICALL                                         $7      
         18        SEND_VAR                                                 $7
         19        DO_ICALL                                         $8      
         20        CONCAT                                           ~9      ~6, $8
         21        CONCAT                                           ~10     ~9, '%5C%2F%5B0-9%5D%7B2%7D%24%7E'
         22        SEND_VAL                                                 ~10
         23        SEND_VAR                                                 !0
         24        SEND_REF                                                 !1
         25        DO_ICALL                                                 
    6    26        INIT_FCALL                                               'var_dump'
         27        SEND_VAR                                                 !1
         28        DO_ICALL                                                 
         29      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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