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

Generated using Vulcan Logic Dumper, using php 8.0.0


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