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<?php function test(){ $x = 'something'; $x += array( 'first' => 'a', 'second' => 'y', 'thrid' => 'z' ); return $x; } $y = test(); echo $y['first'];
based on H6ioi
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Ao1La
function name:  (null)
number of ops:  7
compiled vars:  !0 = $y
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NOP                                                      
  12     1        INIT_FCALL                                               'test'
         2        DO_FCALL                                      0  $1      
         3        ASSIGN                                                   !0, $1
  13     4        FETCH_DIM_R                                      $3      !0, 'first'
         5        ECHO                                                     $3
         6      > RETURN                                                   1

Function test:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Ao1La
function name:  test
number of ops:  4
compiled vars:  !0 = $x
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E >   ASSIGN                                                   !0, 'something'
   6     1        ASSIGN_ADD                                    0          !0, <array>
  10     2      > RETURN                                                   !0
  11     3*     > RETURN                                                   null

End of function test

Generated using Vulcan Logic Dumper, using php 7.3.0