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<?php $key = ''; $arr = array('' => array('foo', 1)); var_dump($arr, $key, $arr[$key]);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/H5J9L
function name:  (null)
number of ops:  9
compiled vars:  !0 = $key, !1 = $arr
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, ''
    4     1        ASSIGN                                                   !1, <array>
    6     2        INIT_FCALL                                               'var_dump'
          3        SEND_VAR                                                 !1
          4        SEND_VAR                                                 !0
          5        FETCH_DIM_R                                      ~4      !1, !0
          6        SEND_VAL                                                 ~4
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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