is_a

(PHP 4 >= 4.2.0, PHP 5)

is_a -- Checks if the object is of this class or has this class as one of its parents

Beschreibung

bool is_a ( object object, string class_name )

Checks if the given object is of this class or has this class as one of its parents.

Anmerkung: The is_a() function is deprecated as of PHP 5 in favor of the instanceof type operator.

Parameter Liste

object

The tested object

class_name

The class name

Rückgabewerte

Returns TRUE if the object is of this class or has this class as one of its parents, FALSE otherwise.

Beispiele

Beispiel 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";
}
?>

Beispiel 2. Using the instanceof operator in PHP 5

<?php
if ($WF instanceof WidgetFactory) {
    echo
'Yes, $WF is a WidgetFactory';
}
?>

Siehe auch

get_class()
get_parent_class()
is_subclass_of()