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<?php $change=""; $k = 2; $change[$k] = "this"; var_dump( $change );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/84hl3
function name:  (null)
number of ops:  8
compiled vars:  !0 = $change, !1 = $k
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, ''
    5     1        ASSIGN                                                       !1, 2
    7     2        ASSIGN_DIM                                                   !0, !1
          3        OP_DATA                                                      'this'
    9     4        INIT_FCALL                                                   'var_dump'
          5        SEND_VAR                                                     !0
          6        DO_ICALL                                                     
          7      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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