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

Generated using Vulcan Logic Dumper, using php 8.0.0


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