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<?php $a=[1,2,3]; $b=$a; $b[0]="x"; print_r($a); print_r($b);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/OuD49
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a, !1 = $b
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        ASSIGN                                                   !1, !0
   5     2        ASSIGN_DIM                                               !1, 0
         3        OP_DATA                                                  'x'
   6     4        INIT_FCALL                                               'print_r'
         5        SEND_VAR                                                 !0
         6        DO_ICALL                                                 
   7     7        INIT_FCALL                                               'print_r'
         8        SEND_VAR                                                 !1
         9        DO_ICALL                                                 
        10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.2.0