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<?php $a = []; $a[0] = 2;
based on mcj88
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/JpiYb
function name:  (null)
number of ops:  4
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        ASSIGN_DIM                                               !0, 0
         2        OP_DATA                                                  2
         3      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.1.0