3v4l.org

run code in 500+ PHP versions simultaneously
<?php function foo(string $a = NULL) { var_dump($a); } foo(); foo('bar'); foo(NULL);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/VYaKq
function name:  (null)
number of ops:  9
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    7     0  E >   INIT_FCALL                                                   'foo'
          1        DO_FCALL                                          0          
    8     2        INIT_FCALL                                                   'foo'
          3        SEND_VAL                                                     'bar'
          4        DO_FCALL                                          0          
    9     5        INIT_FCALL                                                   'foo'
          6        SEND_VAL                                                     null
          7        DO_FCALL                                          0          
          8      > RETURN                                                       1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/VYaKq
function name:  foo
number of ops:  5
compiled vars:  !0 = $a
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   RECV_INIT                                            !0      null
    4     1        INIT_FCALL                                                   'var_dump'
          2        SEND_VAR                                                     !0
          3        DO_ICALL                                                     
    5     4      > RETURN                                                       null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
241.18 ms | 2165 KiB | 17 Q