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<?php function a($depth = 0) { //return last backtrace call. If backtrace bigger then 3, return third call. if($depth === 1000) { if(PHP_VERSION_ID >= 50400) { return array_slice(array_filter(array_slice(debug_backtrace(~ DEBUG_BACKTRACE_PROVIDE_OBJECT & ~ DEBUG_BACKTRACE_IGNORE_ARGS, 3), 0, 3)), -1, 1); } elseif(PHP_VERSION_ID >= 50306) { return array_slice(array_filter(array_slice(debug_backtrace(~ DEBUG_BACKTRACE_PROVIDE_OBJECT), 0, 3)), -1, 1); } elseif(PHP_VERSION_ID >= 50101) { return array_slice(array_filter(array_slice(debug_backtrace(FALSE), 0, 3)), -1, 1); } else return array_slice(array_filter(array_slice(debug_backtrace(), 0, 3)), -1, 1); } return a(++$depth, str_repeat("a", 1000)); } var_dump(a());
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CO6vJ
function name:  (null)
number of ops:  6
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   26     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'a'
          2        DO_FCALL                                      0  $0      
          3        SEND_VAR                                                 $0
          4        DO_ICALL                                                 
          5      > RETURN                                                   1

Function a:
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 77
Branch analysis from position: 3
2 jumps found. (Code = 43) Position 1 = 4, Position 2 = 23
Branch analysis from position: 4
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 23
2 jumps found. (Code = 43) Position 1 = 24, Position 2 = 42
Branch analysis from position: 24
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 42
2 jumps found. (Code = 43) Position 1 = 43, Position 2 = 61
Branch analysis from position: 43
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 61
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 77
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/CO6vJ
function name:  a
number of ops:  88
compiled vars:  !0 = $depth
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV_INIT                                        !0      0
    6     1        IS_IDENTICAL                                             !0, 1000
          2      > JMPZ                                                     ~1, ->77
    8     3    > > JMPZ                                                     <true>, ->23
    9     4    >   INIT_FCALL                                               'array_slice'
          5        INIT_FCALL                                               'array_filter'
          6        INIT_FCALL                                               'array_slice'
          7        INIT_FCALL                                               'debug_backtrace'
          8        SEND_VAL                                                 -4
          9        SEND_VAL                                                 3
         10        DO_ICALL                                         $2      
         11        SEND_VAR                                                 $2
         12        SEND_VAL                                                 0
         13        SEND_VAL                                                 3
         14        DO_ICALL                                         $3      
         15        SEND_VAR                                                 $3
         16        DO_ICALL                                         $4      
         17        SEND_VAR                                                 $4
         18        SEND_VAL                                                 -1
         19        SEND_VAL                                                 1
         20        DO_ICALL                                         $5      
         21      > RETURN                                                   $5
         22*       JMP                                                      ->77
   12    23    > > JMPZ                                                     <true>, ->42
   13    24    >   INIT_FCALL                                               'array_slice'
         25        INIT_FCALL                                               'array_filter'
         26        INIT_FCALL                                               'array_slice'
         27        INIT_FCALL                                               'debug_backtrace'
         28        SEND_VAL                                                 -2
         29        DO_ICALL                                         $6      
         30        SEND_VAR                                                 $6
         31        SEND_VAL                                                 0
         32        SEND_VAL                                                 3
         33        DO_ICALL                                         $7      
         34        SEND_VAR                                                 $7
         35        DO_ICALL                                         $8      
         36        SEND_VAR                                                 $8
         37        SEND_VAL                                                 -1
         38        SEND_VAL                                                 1
         39        DO_ICALL                                         $9      
         40      > RETURN                                                   $9
         41*       JMP                                                      ->77
   16    42    > > JMPZ                                                     <true>, ->61
   17    43    >   INIT_FCALL                                               'array_slice'
         44        INIT_FCALL                                               'array_filter'
         45        INIT_FCALL                                               'array_slice'
         46        INIT_FCALL                                               'debug_backtrace'
         47        SEND_VAL                                                 <false>
         48        DO_ICALL                                         $10     
         49        SEND_VAR                                                 $10
         50        SEND_VAL                                                 0
         51        SEND_VAL                                                 3
         52        DO_ICALL                                         $11     
         53        SEND_VAR                                                 $11
         54        DO_ICALL                                         $12     
         55        SEND_VAR                                                 $12
         56        SEND_VAL                                                 -1
         57        SEND_VAL                                                 1
         58        DO_ICALL                                         $13     
         59      > RETURN                                                   $13
         60*       JMP                                                      ->77
   20    61    >   INIT_FCALL                                               'array_slice'
         62        INIT_FCALL                                               'array_filter'
         63        INIT_FCALL                                               'array_slice'
         64        INIT_FCALL                                               'debug_backtrace'
         65        DO_ICALL                                         $14     
         66        SEND_VAR                                                 $14
         67        SEND_VAL                                                 0
         68        SEND_VAL                                                 3
         69        DO_ICALL                                         $15     
         70        SEND_VAR                                                 $15
         71        DO_ICALL                                         $16     
         72        SEND_VAR                                                 $16
         73        SEND_VAL                                                 -1
         74        SEND_VAL                                                 1
         75        DO_ICALL                                         $17     
         76      > RETURN                                                   $17
   23    77    >   INIT_FCALL_BY_NAME                                       'a'
         78        PRE_INC                                          ~18     !0
         79        SEND_VAL_EX                                              ~18
         80        INIT_FCALL                                               'str_repeat'
         81        SEND_VAL                                                 'a'
         82        SEND_VAL                                                 1000
         83        DO_ICALL                                         $19     
         84        SEND_VAR_NO_REF_EX                                       $19
         85        DO_FCALL                                      0  $20     
         86      > RETURN                                                   $20
   24    87*     > RETURN                                                   null

End of function a

Generated using Vulcan Logic Dumper, using php 8.0.0


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