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is_a

is_a

Checks whether the object is of a given type or subtype

bool **is_a** mixed $object_or_class string $class bool $allow_string

Determines if the given is the object type, or has as one of its supertypes. object_or_class``class``class

object_or_classA class name or an object instance.

classThe class or interface name

allow_string If this parameter set to false, string class name as is not allowed. This also prevents from calling autoloader if the class doesn't exist. object_or_class

Returns true if is the object type, or has as one of its supertypes, false otherwise. object_or_class``class``class

Voorbeeld: 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";
}
?>

Voorbeeld: Using the operator

<?php
// define a class
class WidgetFactory
{
  var $oink = 'moo';
}

// create a new object
$WF = new WidgetFactory();

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

get_class``get_parent_class``is_subclass_of

Vorige ← interface_exists Volgende is_subclass_of →

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