February 12, 2011 
Definition:
function wpmu_admin_do_redirect( $url = '' ) {}
Redirect a user based on $_GET or $_POST arguments.
The function looks for redirect arguments in the following order: 1) $_GET[‘ref’] 2) $_POST[‘ref’] 3) $_SERVER[‘HTTP_REFERER’] 4) $_GET[‘redirect’] 5) $_POST[‘redirect’] 6) $url
Parameters
- string $url
Source code
function wpmu_admin_do_redirect( $url = '' ) {
$ref = '';
if ( isset( $_GET['ref'] ) )
$ref = $_GET['ref'];
if ( isset( $_POST['ref'] ) )
$ref = $_POST['ref'];
if ( $ref ) {
$ref = wpmu_admin_redirect_add_updated_param( $ref );
wp_redirect( $ref );
exit();
}
if ( empty( $_SERVER['HTTP_REFERER'] ) == false ) {
wp_redirect( $_SERVER['HTTP_REFERER'] );
exit();
}
$url = wpmu_admin_redirect_add_updated_param( $url );
if ( isset( $_GET['redirect'] ) ) {
if ( substr( $_GET['redirect'], 0, 2 ) == 's_' )
$url .= '&action=blogs&s='. esc_html( substr( $_GET['redirect'], 2 ) );
} elseif ( isset( $_POST['redirect'] ) ) {
$url = wpmu_admin_redirect_add_updated_param( $_POST['redirect'] );
}
wp_redirect( $url );
exit();
}
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A HitchHackers guide through WordPress 
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