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<?php $t = 5; mul(copyVar($t)); function &copyVar($t) { return $t; } function mul(&$t) { $t *= 5; } var_dump($t);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qMUSp
function name:  (null)
number of ops:  11
compiled vars:  !0 = $t
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 5
    5     1        INIT_FCALL_BY_NAME                                       'mul'
          2        INIT_FCALL_BY_NAME                                       'copyVar'
          3        SEND_VAR_EX                                              !0
          4        DO_FCALL                                      0  $2      
          5        SEND_VAR_NO_REF_EX                                       $2
          6        DO_FCALL                                      0          
   15     7        INIT_FCALL                                               'var_dump'
          8        SEND_VAR                                                 !0
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Function copyvar:
Finding entry points
Branch analysis from position: 0
Return found
filename:       /in/qMUSp
function name:  copyVar
number of ops:  3
compiled vars:  !0 = $t
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   RECV                                             !0      
    8     1      > RETURN_BY_REF                                            !0
    9     2*     > RETURN_BY_REF                                            null

End of function copyvar

Function mul:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/qMUSp
function name:  mul
number of ops:  3
compiled vars:  !0 = $t
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   11     0  E >   RECV                                             !0      
   12     1        ASSIGN_OP                                     3          !0, 5
   13     2      > RETURN                                                   null

End of function mul

Generated using Vulcan Logic Dumper, using php 8.0.0


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