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is_subclass_of (PHP 4, PHP 5) is_subclass_of --
Returns TRUE if the object has this class as one of its parents
Descriptionbool is_subclass_of ( mixed object, string class_name )
This function returns TRUE if the object
object, belongs to a class which is a
subclass of class_name, FALSE otherwise.
Note:
Since PHP 5.0.3 you may also specify the object
parameter as a string (the name of the class).
Example 1. is_subclass_of() example |
<?php
class WidgetFactory
{
var $oink = 'moo';
}
class WidgetFactory_Child extends WidgetFactory
{
var $oink = 'oink';
}
$WF = new WidgetFactory();
$WFC = new WidgetFactory_Child();
if (is_subclass_of($WFC, 'WidgetFactory')) {
echo "yes, \$WFC is a subclass of WidgetFactory\n";
} else {
echo "no, \$WFC is not a subclass of WidgetFactory\n";
}
if (is_subclass_of($WF, 'WidgetFactory')) {
echo "yes, \$WF is a subclass of WidgetFactory\n";
} else {
echo "no, \$WF is not a subclass of WidgetFactory\n";
}
if (is_subclass_of('WidgetFactory_Child', 'WidgetFactory')) {
echo "yes, WidgetFactory_Child is a subclass of WidgetFactory\n";
} else {
echo "no, WidgetFactory_Child is not a subclass of WidgetFactory\n";
}
?>
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The above example will output: yes, $WFC is a subclass of WidgetFactory
no, $WF is not a subclass of WidgetFactory
yes, WidgetFactory_Child is a subclass of WidgetFactory |
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See also get_class(),
get_parent_class() and
is_a().
User Contributed Notes
is_subclass_of
youcantryreachingme at REMOVEME dot hotmail dot com
21-Mar-2005 08:15
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.
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is_a