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<?php $arr = [1,2,3,4]; var_dump($arr); // incorrect way: $arr = [1,2]; var_dump($arr); //correct way $arr = [1,2,3,4]; $arr[] = [1,2]; var_dump($arr);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ZTg28
function name:  (null)
number of ops:  15
compiled vars:  !0 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    4     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    7     4        ASSIGN                                                   !0, <array>
    8     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
   11     8        ASSIGN                                                   !0, <array>
   12     9        ASSIGN_DIM                                               !0
         10        OP_DATA                                                  <array>
   13    11        INIT_FCALL                                               'var_dump'
         12        SEND_VAR                                                 !0
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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