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<?php $factors = '(x-5)(x+2)(x-1)(x+2)'; $factors = preg_split('/(?<=\))(?=\()/', $factors); print_r($factors); if (count($factors) != count(array_unique($factors))) { echo "duplicate factors found!"; };
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 16, Position 2 = 17
Branch analysis from position: 16
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 17
filename:       /in/1l9qD
function name:  (null)
number of ops:  18
compiled vars:  !0 = $factors
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%28x-5%29%28x%2B2%29%28x-1%29%28x%2B2%29'
    4     1        INIT_FCALL                                               'preg_split'
          2        SEND_VAL                                                 '%2F%28%3F%3C%3D%5C%29%29%28%3F%3D%5C%28%29%2F'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $2      
          5        ASSIGN                                                   !0, $2
    5     6        INIT_FCALL                                               'print_r'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                                 
    6     9        COUNT                                            ~5      !0
         10        INIT_FCALL                                               'array_unique'
         11        SEND_VAR                                                 !0
         12        DO_ICALL                                         $6      
         13        COUNT                                            ~7      $6
         14        IS_NOT_EQUAL                                             ~5, ~7
         15      > JMPZ                                                     ~8, ->17
    7    16    >   ECHO                                                     'duplicate+factors+found%21'
    8    17    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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