3v4l.org

run code in 500+ PHP versions simultaneously
<?php function is_cyclic(&$array) { $isRecursive = false; set_error_handler(function ($errno, $errstr) use (&$isRecursive) { $isRecursive = $errno === E_WARNING && mb_stripos($errstr, 'recursion'); }); try { count($array, COUNT_RECURSIVE); } finally { restore_error_handler(); } return $isRecursive; } $array = [1, [2, 3]]; $array[1][1] = &$array; var_dump(is_cyclic($array));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OWbCE
function name:  (null)
number of ops:  11
compiled vars:  !0 = $array
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
   16     0  E >   ASSIGN                                                       !0, <array>
   17     1        FETCH_DIM_W                                          $2      !0, 1
          2        FETCH_DIM_W                                          $3      $2, 1
          3        ASSIGN_REF                                                   $3, !0
   18     4        INIT_FCALL                                                   'var_dump'
          5        INIT_FCALL                                                   'is_cyclic'
          6        SEND_REF                                                     !0
          7        DO_FCALL                                          0  $5      
          8        SEND_VAR                                                     $5
          9        DO_ICALL                                                     
         10      > RETURN                                                       1

Function is_cyclic:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 162) Position 1 = 13, Position 2 = 12
Branch analysis from position: 13
1 jumps found. (Code = 163) Position 1 = -2
Branch analysis from position: 12
1 jumps found. (Code = 42) Position 1 = 16
Branch analysis from position: 16
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/OWbCE
function name:  is_cyclic
number of ops:  18
compiled vars:  !0 = $array, !1 = $isRecursive
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   RECV                                                 !0      
    4     1        ASSIGN                                                       !1, <false>
    5     2        INIT_FCALL                                                   'set_error_handler'
          3        DECLARE_LAMBDA_FUNCTION                              ~3      [0]
          4        BIND_LEXICAL                                                 ~3, !1
    7     5        SEND_VAL                                                     ~3
    5     6        DO_ICALL                                                     
    9     7        INIT_FCALL                                                   'count'
          8        SEND_VAR                                                     !0
          9        SEND_VAL                                                     1
         10        DO_ICALL                                                     
   10    11      > FAST_CALL                                                    ->13
         12    > > JMP                                                          ->16
   11    13    >   INIT_FCALL                                                   'restore_error_handler'
         14        DO_ICALL                                                     
         15      > FAST_RET                                                     
   13    16    > > RETURN                                                       !1
   14    17*     > RETURN                                                       null


Dynamic Functions:
Dynamic Function 0
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 46) Position 1 = 5, Position 2 = 10
Branch analysis from position: 5
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 10
filename:       /in/OWbCE
function name:  {closure:is_cyclic():5}
number of ops:  12
compiled vars:  !0 = $errno, !1 = $errstr, !2 = $isRecursive
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    5     0  E >   RECV                                                 !0      
          1        RECV                                                 !1      
          2        BIND_STATIC                                                  !2
    6     3        IS_IDENTICAL                                         ~3      !0, 2
          4      > JMPZ_EX                                              ~3      ~3, ->10
          5    >   INIT_FCALL                                                   'mb_stripos'
          6        SEND_VAR                                                     !1
          7        SEND_VAL                                                     'recursion'
          8        DO_ICALL                                             $4      
          9        BOOL                                                 ~3      $4
         10    >   ASSIGN                                                       !2, ~3
    7    11      > RETURN                                                       null

End of Dynamic Function 0

End of function is_cyclic

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
171.1 ms | 1977 KiB | 19 Q