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<?php $rob = ''; $rob[] = 'abc'; var_dump($rob);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/d8LBE
function name:  (null)
number of ops:  7
compiled vars:  !0 = $rob
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, ''
   5     1        ASSIGN_DIM                                               !0
         2        OP_DATA                                                  'abc'
   7     3        INIT_FCALL                                               'var_dump'
         4        SEND_VAR                                                 !0
         5        DO_ICALL                                                 
         6      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0