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is_a

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(PHP 4 >= 4.2.0, PHP 5, PHP 7)

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

Description

is_a ( mixed $object , string $class_name [, bool $allow_string = FALSE ] ) : bool

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

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Parameters

object

A class name or an object instance.

class_name

The class name

allow_string

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

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Return Values

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

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Changelog

Version Description
5.3.9 Added allow_string parameter
5.3.0 This function is no longer deprecated, and will therefore no longer throw E_STRICT warnings.
5.0.0 This function became deprecated in favour of the instanceof operator. Calling this function will result in an E_STRICT warning.

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Examples

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";
}
?>

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() - Returns the name of the class of an object
  • get_parent_class() - Retrieves the parent class name for object or class
  • is_subclass_of() - Checks if the object has this class as one of its parents or implements it

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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-is-a.html

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References

  1. View the html document Language of the document:fr Manuel PHP : http://php.net

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