is_a
It would appear that is_subclass_of is case insensitive unlike get_class in php5.
i.e.
<?php
class fooBar {}
class bar extends fooBar {}
assert(get_class(new fooBar()) == "fooBar");
assert(is_subclass_of(new bar(), "foobar") == true);
?>
i run across this while migrating some code from php4 to php5 and the code would only half-the-time break.
is_subclass_of
(PHP 4, PHP 5)
is_subclass_of — Возвращает TRUE если объект является экземпляром класса, наследующего данный.
Описание
bool is_subclass_of
( object $object
, string $class_name
)
Возвращает TRUE если объект object является экземпляром класса, наследующего class_name . В противном случае возвращается FALSE
См. также get_class(), get_parent_class() и is_a().
add a note
User Contributed Notesis_subclass_of
jm
01-Oct-2008 05:02
01-Oct-2008 05:02
Ondra Zizka
13-Oct-2006 02:31
13-Oct-2006 02:31
For PHP4:
/** Returns whether specified class is subclass of the other class. */
function is_subclass($sClass, $sExpectedParentClass){
do if( $sExpectedParentClass === $sClass ) return true;
while( false != ($sClass = get_parent_class($sClass)) );
return false;
}
// Test:
class A {} class B extends A {} class C extends B {} echo (int) is_subclass('C', 'A');
gunniboyh at web dot de
20-May-2006 03:16
20-May-2006 03:16
is_subclass_of() works also with classes between the class of obj and the superclass.
example:
<?php
class A {};
class B extends A {};
class C extends B {};
$foo=new C();
echo ((is_subclass_of($foo,'A')) ? 'true' : 'false');
?>
echoes 'true' .
01-Oct-2005 03:32
this function does not check interfaces, unlike instanceof operator.
youcantryreachingme at REMOVEME dot hotmail dot com
22-Mar-2005 03:15
22-Mar-2005 03:15
A bug report at http://pear.php.net/bugs/bug.php?id=2975 indicates that the "is_subclass_of" function can return the error message:
Warning: Unknown class passed as parameter
in the event that the class represented by the second argument hasn't yet been instantiated.