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<?php $x = &$row['test']; print_r($row);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/rQCss
function name:  (null)
number of ops:  6
compiled vars:  !0 = $x, !1 = $row
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   FETCH_DIM_W                                      $2      !1, 'test'
         1        ASSIGN_CONCAT                                 0          !0, $2
   5     2        INIT_FCALL                                               'print_r'
         3        SEND_VAR                                                 !1
         4        DO_ICALL                                                 
         5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0