Title: is_site_admin
Published: April 25, 2014
Last modified: February 24, 2026

---

# is_site_admin( string $user_login )

## In this article

 * [Description](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#description)
    - [See also](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#see-also)
 * [Parameters](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#parameters)
 * [Source](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#source)
 * [Related](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#related)
 * [Changelog](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#changelog)

[ Back to top](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#wp--skip-link--target)

This function has been deprecated since 3.0.0. Use [is_super_admin()](https://developer.wordpress.org/reference/functions/is_super_admin/)
instead.

Determine if user is a site admin.

## 󠀁[Description](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#description)󠁿

Plugins should use [is_multisite()](https://developer.wordpress.org/reference/functions/is_multisite/)
instead of checking if this function exists to determine if multisite is enabled.

This function must reside in a file included only if [is_multisite()](https://developer.wordpress.org/reference/functions/is_multisite/)
due to legacy function_exists() checks to determine if multisite is enabled.

### 󠀁[See also](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#see-also)󠁿

 * [is_super_admin()](https://developer.wordpress.org/reference/functions/is_super_admin/)

## 󠀁[Parameters](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#parameters)󠁿

 `$user_login`stringoptional

Username for the user to check. Default empty.

## 󠀁[Source](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#source)󠁿

    ```php
    function is_site_admin( $user_login = '' ) {
    	_deprecated_function( __FUNCTION__, '3.0.0', 'is_super_admin()' );

    	if ( empty( $user_login ) ) {
    		$user_id = get_current_user_id();
    		if ( !$user_id )
    			return false;
    	} else {
    		$user = get_user_by( 'login', $user_login );
    		if ( ! $user->exists() )
    			return false;
    		$user_id = $user->ID;
    	}

    	return is_super_admin( $user_id );
    }
    ```

[View all references](https://developer.wordpress.org/reference/files/wp-includes/ms-deprecated.php/)
[View on Trac](https://core.trac.wordpress.org/browser/tags/6.9.4/src/wp-includes/ms-deprecated.php#L64)
[View on GitHub](https://github.com/WordPress/wordpress-develop/blob/6.9.4/src/wp-includes/ms-deprecated.php#L64-L79)

## 󠀁[Related](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#related)󠁿

| Uses | Description | 
| [is_super_admin()](https://developer.wordpress.org/reference/functions/is_super_admin/)`wp-includes/capabilities.php` |

Determines whether user is a site admin.

  | 
| [get_user_by()](https://developer.wordpress.org/reference/functions/get_user_by/)`wp-includes/pluggable.php` |

Retrieves user info by a given field.

  | 
| [_deprecated_function()](https://developer.wordpress.org/reference/functions/_deprecated_function/)`wp-includes/functions.php` |

Marks a function as deprecated and inform when it has been used.

  | 
| [get_current_user_id()](https://developer.wordpress.org/reference/functions/get_current_user_id/)`wp-includes/user.php` |

Gets the current user’s ID.

  |

[Show 2 more](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#)
[Show less](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#)

## 󠀁[Changelog](https://developer.wordpress.org/reference/functions/is_site_admin/?output_format=md#changelog)󠁿

| Version | Description | 
| [3.0.0](https://developer.wordpress.org/reference/since/3.0.0/) | Deprecated. Use [is_super_admin()](https://developer.wordpress.org/reference/functions/is_super_admin/)  | 
| [MU (3.0.0)](https://developer.wordpress.org/reference/since/mu.3.0.0/) | Introduced. |

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