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<?php $values = array('1','2'); $is_multidim = (bool) count(array_filter($values, 'is_array')); var_dump($is_multidim); var_dump(isset($values[0]), $values[0]); var_dump(isset($values[0][0]), $values[0][0]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/V9CJc
function name:  (null)
number of ops:  26
compiled vars:  !0 = $values, !1 = $is_multidim
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, <array>
    3     1        INIT_FCALL                                               'array_filter'
          2        SEND_VAR                                                 !0
          3        SEND_VAL                                                 'is_array'
          4        DO_ICALL                                         $3      
          5        COUNT                                            ~4      $3
          6        BOOL                                             ~5      ~4
          7        ASSIGN                                                   !1, ~5
    4     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAR                                                 !1
         10        DO_ICALL                                                 
    5    11        INIT_FCALL                                               'var_dump'
         12        ISSET_ISEMPTY_DIM_OBJ                         0  ~8      !0, 0
         13        SEND_VAL                                                 ~8
         14        FETCH_DIM_R                                      ~9      !0, 0
         15        SEND_VAL                                                 ~9
         16        DO_ICALL                                                 
    6    17        INIT_FCALL                                               'var_dump'
         18        FETCH_DIM_IS                                     ~11     !0, 0
         19        ISSET_ISEMPTY_DIM_OBJ                         0  ~12     ~11, 0
         20        SEND_VAL                                                 ~12
         21        FETCH_DIM_R                                      ~13     !0, 0
         22        FETCH_DIM_R                                      ~14     ~13, 0
         23        SEND_VAL                                                 ~14
         24        DO_ICALL                                                 
         25      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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