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<?php $row = []; $test = $row['Voorraad']; var_dump(!is_null($test));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/QL6Xh
function name:  (null)
number of ops:  9
compiled vars:  !0 = $row, !1 = $test
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        FETCH_DIM_R                                      ~3      !0, 'Voorraad'
          2        ASSIGN                                                   !1, ~3
    5     3        INIT_FCALL                                               'var_dump'
          4        TYPE_CHECK                                    2  ~5      !1
          5        BOOL_NOT                                         ~6      ~5
          6        SEND_VAL                                                 ~6
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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