is_object()

(PHP 4, PHP 5, PHP 7)

检测变量是否是一个对象

描述

如果$var是一个object则返回TRUE，否则返回FALSE。

参见is_bool()、is_int()、is_integer()、is_float()、is_string()和is_array()。

Note: is_object(null) returns false
This should actually be part of the input/output specification at the top of this page.

Unserializes data as returned by the standard PHP serialize() function. If the unserialized object is not an array, it will be converted to one, particularily useful if it returns a __PHP_Incomplete_Class. 

Thank you victor AT fourstones DOT net.
I have written a function to do what victor has suggested, with the ease of use of is_object. It can be used to replace is_object(), but has an extra field [$check], to compare to a certain name. If $check is left empty, it will just check if &$object is an object.

This could probably be cleaned up, but it's spaced out to be easy to read.

I'm not even sure how to articulate this, so I'm going to just include test code. Maybe someone else will someday wonder the same thing.

This prints "yes,yes,no,no". Basically this shows that you can use is_object to test if the child object is an object without worrying about an error if the parent object isn't an object either.

You can use is_object($this) to detect if the function is being called via instance or procedure.
Example:

This would output:
this is an instance call 
this is a procedure call 
:-) Happy coding!

er, I don't think that's right, especially if calling from another object instance:

yields:
---------- run-php ----------
oops
this is ok
static call

Just discovered:
is_a ( object $object , string $class_name )
Which checks if the object is of this class or has this class as one of its parents
Which seems to do what a lot here are trying to replicate

Cleaning it up even more: 

cleaned up peter's code... use only one return statement
function is_obj( &$object, $check=null, $strict=true )
{
$result = false;
 if (is_object($object)) {
   if ($check == null) {
     $result = true;
   } else {
      $object_name = get_class($object);
      $result = ($strict === true)?
        ( $object_name == $check ):
        ( strtolower($object_name) == strtolower($check) );
   }  
 }
return $result;
}

Use instanceof() to check for a specific type.

Note that closures return true when passed to is_object():

Returns true (1)

here i created one function that i wanted to find but i had never found :X
  function compare_two_object_recursive($object_1, $object_2, $object_1_Identifier = false, $object_2_Identifier = false){
    $object1 = (array)$object_1;
    $object2 = (array)$object_2;
    $object3 = array();
    
    $o1i = $object_1_Identifier ? $object_1_Identifier : 1;
    $o2i = $object_2_Identifier ? $object_2_Identifier : 2;
    
    foreach($object1 as $key => $value){
      if(is_object($object1[$key])){
        $object1[$key] = (array)$object1[$key];
        $object2[$key] = (array)$object2[$key];
        $object3[$key] = (object)compare_two_object_recursive($object1[$key], $object2[$key], $o1i, $o2i);
      }elseif(is_array($object1[$key])){
        $object3[$key] = compare_two_object_recursive($object1[$key], $object2[$key], $o1i, $o2i);
      }else{
        if($object1[$key] == $object2[$key]){
          $object3[$key]['comparison_status'] = "SAME";
        }else{
          $object3[$key]['comparison_status'] = "NOT THE SAME";
          $object3[$key][$o1i] = $object1[$key];
          $object3[$key][$o2i] = $object2[$key];
        }
      }
    }
    return $object3;
  }

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