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<?php enum Foo: int { case Foo = 0; } enum Bar: string { case Bar = 'baz'; } enum Baz { case Baz; } function get_backing_type(string $enum_class): ?string { return (new ReflectionEnum($enum_class))->getBackingType()?->getName(); } function is_int_enum(string $enum_class): bool { return get_backing_type($enum_class) === 'int'; } function is_string_enum(string $enum_class): bool { return get_backing_type($enum_class) === 'string'; } var_dump(get_backing_type(Foo::class)); var_dump(get_backing_type(Bar::class)); var_dump(get_backing_type(Baz::class)); var_dump(is_int_enum(Foo::class)); var_dump(is_string_enum(Bar::class));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/YN3mA
function name:  (null)
number of ops:  34
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   DECLARE_CLASS                                            'foo'
    7     1        DECLARE_CLASS                                            'bar'
   11     2        DECLARE_CLASS                                            'baz'
   27     3        INIT_FCALL                                               'var_dump'
          4        INIT_FCALL                                               'get_backing_type'
          5        SEND_VAL                                                 'Foo'
          6        DO_FCALL                                      0  $0      
          7        SEND_VAR                                                 $0
          8        DO_ICALL                                                 
   28     9        INIT_FCALL                                               'var_dump'
         10        INIT_FCALL                                               'get_backing_type'
         11        SEND_VAL                                                 'Bar'
         12        DO_FCALL                                      0  $2      
         13        SEND_VAR                                                 $2
         14        DO_ICALL                                                 
   29    15        INIT_FCALL                                               'var_dump'
         16        INIT_FCALL                                               'get_backing_type'
         17        SEND_VAL                                                 'Baz'
         18        DO_FCALL                                      0  $4      
         19        SEND_VAR                                                 $4
         20        DO_ICALL                                                 
   31    21        INIT_FCALL                                               'var_dump'
         22        INIT_FCALL                                               'is_int_enum'
         23        SEND_VAL                                                 'Foo'
         24        DO_FCALL                                      0  $6      
         25        SEND_VAR                                                 $6
         26        DO_ICALL                                                 
   32    27        INIT_FCALL                                               'var_dump'
         28        INIT_FCALL                                               'is_string_enum'
         29        SEND_VAL                                                 'Bar'
         30        DO_FCALL                                      0  $8      
         31        SEND_VAR                                                 $8
         32        DO_ICALL                                                 
         33      > RETURN                                                   1

Function get_backing_type:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/YN3mA
function name:  get_backing_type
number of ops:  13
compiled vars:  !0 = $enum_class
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   15     0  E >   RECV                                             !0      
   16     1        NEW                                              $1      'ReflectionEnum'
          2        SEND_VAR_EX                                              !0
          3        DO_FCALL                                      0          
          4        INIT_METHOD_CALL                                         $1, 'getBackingType'
          5        DO_FCALL                                      0  $3      
          6        JMP_NULL                                         $4      $3
          7        INIT_METHOD_CALL                                         $3, 'getName'
          8        DO_FCALL                                      0  $4      
          9        VERIFY_RETURN_TYPE                                       $4
         10      > RETURN                                                   $4
   17    11*       VERIFY_RETURN_TYPE                                       
         12*     > RETURN                                                   null

End of function get_backing_type

Function is_int_enum:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/YN3mA
function name:  is_int_enum
number of ops:  9
compiled vars:  !0 = $enum_class
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   19     0  E >   RECV                                             !0      
   20     1        INIT_FCALL                                               'get_backing_type'
          2        SEND_VAR                                                 !0
          3        DO_FCALL                                      0  $1      
          4        IS_IDENTICAL                                     ~2      $1, 'int'
          5        VERIFY_RETURN_TYPE                                       ~2
          6      > RETURN                                                   ~2
   21     7*       VERIFY_RETURN_TYPE                                       
          8*     > RETURN                                                   null

End of function is_int_enum

Function is_string_enum:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/YN3mA
function name:  is_string_enum
number of ops:  9
compiled vars:  !0 = $enum_class
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   23     0  E >   RECV                                             !0      
   24     1        INIT_FCALL                                               'get_backing_type'
          2        SEND_VAR                                                 !0
          3        DO_FCALL                                      0  $1      
          4        IS_IDENTICAL                                     ~2      $1, 'string'
          5        VERIFY_RETURN_TYPE                                       ~2
          6      > RETURN                                                   ~2
   25     7*       VERIFY_RETURN_TYPE                                       
          8*     > RETURN                                                   null

End of function is_string_enum

Class Foo: [no user functions]
Class Bar: [no user functions]
Class Baz: [no user functions]

Generated using Vulcan Logic Dumper, using php 8.0.0


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