get_admin_url() WP 1.0

Retrieves the URL to the admin area for a given site.

No Hooks.

Return

String. Admin URL link with optional path appended.

Usage

get_admin_url( $blog_id, $path, $scheme );

$blog_id(int)

Site ID.
Default: null (current site)

$path(string)

Path relative to the admin URL.
Default: ''

$scheme(string)

The scheme to use. Accepts 'http' or 'https', to force those schemes.
Default: 'admin', which obeys force_ssl_admin() and is_ssl()

Code of get_admin_url: wp-includes/link-template.php ^{VER 5.0}

<?php
function get_admin_url( $blog_id = null, $path = '', $scheme = 'admin' ) {
	$url = get_site_url($blog_id, 'wp-admin/', $scheme);

	if ( $path && is_string( $path ) )
		$url .= ltrim( $path, '/' );

	/**
	 * Filters the admin area URL.
	 *
	 * @since 2.8.0
	 *
	 * @param string   $url     The complete admin area URL including scheme and path.
	 * @param string   $path    Path relative to the admin area URL. Blank string if no path is specified.
	 * @param int|null $blog_id Site ID, or null for the current site.
	 */
	return apply_filters( 'admin_url', $url, $path, $blog_id );
}

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From category: Admin Menu

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