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<?php $date = "13/23/15"; echo $x = '~^(?:' . implode('|', range(1, 12)) . ')\/(?:' . implode('|', range(1, 31)) . ')\/[0-9]{2}$~'; preg_match($x, $date, $m); var_dump($m);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/6Bdd5
function name:  (null)
number of ops:  32
compiled vars:  !0 = $date, !1 = $x, !2 = $m
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '13%2F23%2F15'
    4     1        INIT_FCALL                                               'implode'
          2        SEND_VAL                                                 '%7C'
          3        INIT_FCALL                                               'range'
          4        SEND_VAL                                                 1
          5        SEND_VAL                                                 12
          6        DO_ICALL                                         $4      
          7        SEND_VAR                                                 $4
          8        DO_ICALL                                         $5      
          9        CONCAT                                           ~6      '%7E%5E%28%3F%3A', $5
         10        CONCAT                                           ~7      ~6, '%29%5C%2F%28%3F%3A'
         11        INIT_FCALL                                               'implode'
         12        SEND_VAL                                                 '%7C'
         13        INIT_FCALL                                               'range'
         14        SEND_VAL                                                 1
         15        SEND_VAL                                                 31
         16        DO_ICALL                                         $8      
         17        SEND_VAR                                                 $8
         18        DO_ICALL                                         $9      
         19        CONCAT                                           ~10     ~7, $9
         20        CONCAT                                           ~11     ~10, '%29%5C%2F%5B0-9%5D%7B2%7D%24%7E'
         21        ASSIGN                                           ~12     !1, ~11
         22        ECHO                                                     ~12
    5    23        INIT_FCALL                                               'preg_match'
         24        SEND_VAR                                                 !1
         25        SEND_VAR                                                 !0
         26        SEND_REF                                                 !2
         27        DO_ICALL                                                 
    7    28        INIT_FCALL                                               'var_dump'
         29        SEND_VAR                                                 !2
         30        DO_ICALL                                                 
         31      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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