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<?php function f($a) { if ($a > 0) { $b = f($a-1); } return $b; } echo f(1);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/4m0HZ
function name:  (null)
number of ops:  5
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   8     0  E >   INIT_FCALL                                               'f'
         1        SEND_VAL                                                 1
         2        DO_FCALL                                      0  $0      
         3        ASSIGN_OBJ                                               $0
         4      > RETURN                                                   1

Function f:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 8
Branch analysis from position: 3
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 8
filename:       /in/4m0HZ
function name:  f
number of ops:  10
compiled vars:  !0 = $a, !1 = $b
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   RECV                                             !0      
   3     1        IS_SMALLER_OR_EQUAL                              ~2      0, !0
         2      > JMPZ                                                     ~2, ->8
   4     3    >   INIT_FCALL_BY_NAME                                       'f'
         4        SUB                                              ~3      !0, 1
         5        SEND_VAL_EX                                              ~3
         6        DO_FCALL                                      0  $4      
         7        QM_ASSIGN                                                !1
   6     8    > > RETURN                                                   !1
   7     9*     > RETURN                                                   null

End of function f

Generated using Vulcan Logic Dumper, using php 7.4.0