is_a
(PHP 4 >= 4.2.0, PHP 5)
is_a --
Returns
TRUE if the object is of this class or has this class as
one of its parents
Description
bool
is_a ( object object, string class_name )
This function returns TRUE if the object is of this class or
has this class as one of its parents, FALSE otherwise.
Example 1. is_a() example
<?php
// define a class
class WidgetFactory
{
var $oink = 'moo';
}
// create a new object
$WF = new WidgetFactory();
if (is_a($WF, 'WidgetFactory')) {
echo "yes, \$WF is still a WidgetFactory\n";
}
?>
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The is_a() function is deprecated as of PHP 5 in
favor of the instanceof
type operator. In the above example we could use the following in
PHP 5:
Example 2. Using the instanceof operator in PHP 5
<?php
if ($WF instanceof WidgetFactory) {
echo 'Yes, $WF is a WidgetFactory';
}
?>
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See also get_class(),
get_parent_class(), and
is_subclass_of().