3v4l.org

run code in 300+ PHP versions simultaneously
<?php function fib($n){ if($n == 0){ return 1; } return fib($n - 1, $n - 2); } print fib(5);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/79bFS
function name:  (null)
number of ops:  5
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   11     0  E >   INIT_FCALL                                               'fib'
          1        SEND_VAL                                                 5
          2        DO_FCALL                                      0  $0      
          3        ECHO                                                     $0
          4      > RETURN                                                   1

Function fib:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 4
Branch analysis from position: 3
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 4
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/79bFS
function name:  fib
number of ops:  12
compiled vars:  !0 = $n
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        IS_EQUAL                                                 !0, 0
          2      > JMPZ                                                     ~1, ->4
    5     3    > > RETURN                                                   1
    7     4    >   INIT_FCALL_BY_NAME                                       'fib'
          5        SUB                                              ~2      !0, 1
          6        SEND_VAL_EX                                              ~2
          7        SUB                                              ~3      !0, 2
          8        SEND_VAL_EX                                              ~3
          9        DO_FCALL                                      0  $4      
         10      > RETURN                                                   $4
    9    11*     > RETURN                                                   null

End of function fib

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
132.51 ms | 1401 KiB | 14 Q