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<?php list($a[],$a[]) = array(1,2); var_dump($a,$a);
based on rZqnv
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/L6qhH
function name:  (null)
number of ops:  11
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   FETCH_LIST                                       $1      <array>, 0
         1        ASSIGN_DIM                                               !0
         2        OP_DATA                                                  $1
         3        FETCH_LIST                                       $3      <array>, 1
         4        ASSIGN_DIM                                               !0
         5        OP_DATA                                                  $3
   4     6        INIT_FCALL                                               'var_dump'
         7        SEND_VAR                                                 !0
         8        SEND_VAR                                                 !0
         9        DO_ICALL                                                 
        10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.3.0