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<?php $myvar = '[{"value":"11","label":"labelQuery"}]'; print_r(strlen(json_decode($myvar)));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ClJaO
function name:  (null)
number of ops:  9
compiled vars:  !0 = $myvar
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '%5B%7B%22value%22%3A%2211%22%2C%22label%22%3A%22labelQuery%22%7D%5D'
    3     1        INIT_FCALL                                               'print_r'
          2        INIT_FCALL                                               'json_decode'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $2      
          5        STRLEN                                           ~3      $2
          6        SEND_VAL                                                 ~3
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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