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<?php $date = "4/23/15"; echo $s = '~^' . implode('|', range(1, 12)) . '\/' . implode('|', range(1, 31)) . '\/[0-9]{2}$~'; 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/5o1q9
function name:  (null)
number of ops:  32
compiled vars:  !0 = $date, !1 = $s, !2 = $x, !3 = $m
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '4%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                                         $5      
          7        SEND_VAR                                                 $5
          8        DO_ICALL                                         $6      
          9        CONCAT                                           ~7      '%7E%5E', $6
         10        CONCAT                                           ~8      ~7, '%5C%2F'
         11        INIT_FCALL                                               'implode'
         12        SEND_VAL                                                 '%7C'
         13        INIT_FCALL                                               'range'
         14        SEND_VAL                                                 1
         15        SEND_VAL                                                 31
         16        DO_ICALL                                         $9      
         17        SEND_VAR                                                 $9
         18        DO_ICALL                                         $10     
         19        CONCAT                                           ~11     ~8, $10
         20        CONCAT                                           ~12     ~11, '%5C%2F%5B0-9%5D%7B2%7D%24%7E'
         21        ASSIGN                                           ~13     !1, ~12
         22        ECHO                                                     ~13
    5    23        INIT_FCALL                                               'preg_match'
         24        SEND_VAR                                                 !2
         25        SEND_VAR                                                 !0
         26        SEND_REF                                                 !3
         27        DO_ICALL                                                 
    7    28        INIT_FCALL                                               'var_dump'
         29        SEND_VAR                                                 !3
         30        DO_ICALL                                                 
         31      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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