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<?php $flag_input = str_split($_POST['flag']); $what_ist_thiss = array(); $what_is_thisss = 0; ?>
based on 2ehUU
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/JLtf3
function name:  (null)
number of ops:  9
compiled vars:  !0 = $flag_input, !1 = $what_ist_thiss, !2 = $what_is_thisss
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'str_split'
         1        FETCH_R                      global              ~3      '_POST'
         2        FETCH_DIM_R                                      ~4      ~3, 'flag'
         3        SEND_VAL                                                 ~4
         4        DO_ICALL                                         $5      
         5        ASSIGN                                                   !0, $5
   3     6        ASSIGN                                                   !1, <array>
   4     7        ASSIGN                                                   !2, 0
   5     8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0