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<?php class Foo { public $bar; public $baz; public $taz; } // please note that this API has a signature of `object $object` - any object allowed. function unsetProperties($object) { // we ignore inheritance and private properties for simplicity return array_diff( array_map( function (\ReflectionProperty $p) : string { return $p->getName(); }, (new ReflectionClass($object))->getProperties() ), array_keys((array) $object) ); } var_dump(unsetProperties(new Foo)); $foo = new Foo; unset($foo->baz); var_dump(unsetProperties($foo));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Tj0GH
function name:  (null)
number of ops:  19
compiled vars:  !0 = $foo
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   24     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'unsetproperties'
          2        NEW                                              $1      'Foo'
          3        DO_FCALL                                      0          
          4        SEND_VAR                                                 $1
          5        DO_FCALL                                      0  $3      
          6        SEND_VAR                                                 $3
          7        DO_ICALL                                                 
   26     8        NEW                                              $5      'Foo'
          9        DO_FCALL                                      0          
         10        ASSIGN                                                   !0, $5
   28    11        UNSET_OBJ                                                !0, 'baz'
   30    12        INIT_FCALL                                               'var_dump'
         13        INIT_FCALL                                               'unsetproperties'
         14        SEND_VAR                                                 !0
         15        DO_FCALL                                      0  $8      
         16        SEND_VAR                                                 $8
         17        DO_ICALL                                                 
         18      > RETURN                                                   1

Function unsetproperties:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Tj0GH
function name:  unsetProperties
number of ops:  21
compiled vars:  !0 = $object
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   11     0  E >   RECV                                             !0      
   13     1        INIT_FCALL                                               'array_diff'
   14     2        INIT_FCALL                                               'array_map'
   15     3        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FTj0GH%3A15%240'
   17     4        SEND_VAL                                                 ~1
   18     5        NEW                                              $2      'ReflectionClass'
          6        SEND_VAR_EX                                              !0
          7        DO_FCALL                                      0          
          8        INIT_METHOD_CALL                                         $2, 'getProperties'
          9        DO_FCALL                                      0  $4      
         10        SEND_VAR                                                 $4
         11        DO_ICALL                                         $5      
         12        SEND_VAR                                                 $5
   20    13        INIT_FCALL                                               'array_keys'
         14        CAST                                          7  ~6      !0
         15        SEND_VAL                                                 ~6
         16        DO_ICALL                                         $7      
         17        SEND_VAR                                                 $7
         18        DO_ICALL                                         $8      
         19      > RETURN                                                   $8
   22    20*     > RETURN                                                   null

End of function unsetproperties

Function %00%7Bclosure%7D%2Fin%2FTj0GH%3A15%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/Tj0GH
function name:  {closure}
number of ops:  7
compiled vars:  !0 = $p
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   15     0  E >   RECV                                             !0      
   16     1        INIT_METHOD_CALL                                         !0, 'getName'
          2        DO_FCALL                                      0  $1      
          3        VERIFY_RETURN_TYPE                                       $1
          4      > RETURN                                                   $1
   17     5*       VERIFY_RETURN_TYPE                                       
          6*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FTj0GH%3A15%240

Class Foo: [no user functions]

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