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<?php error_reporting(E_ALL); function foo(){ return 'string'; } $temp =& foo();
based on p9JNm
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/vXUIZ
function name:  (null)
number of ops:  8
compiled vars:  !0 = $temp
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'error_reporting'
         1        SEND_VAL                                                 32767
         2        DO_ICALL                                                 
   3     3        NOP                                                      
   6     4        INIT_FCALL                                               'foo'
         5        DO_FCALL                                      0  $2      
         6        ASSIGN_REF                                               !0, $2
         7      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/vXUIZ
function name:  foo
number of ops:  2
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   4     0  E > > RETURN                                                   'string'
   5     1*     > RETURN                                                   null

End of function foo

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