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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.

PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.

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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

Description

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.

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

Parameters

object

The tested object

class_name

The class name

Return Values

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

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';
}
?>

See Also

get_class()
get_parent_class()
is_subclass_of()

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Another Useful functions:


zend-api.zend-u-is-auto-global | zend-api.zend-is-auto-global | function.is-array | function.is-a | function.iis-add-server |


PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.