vip_substr_redirects.php

function vip_substr_redirects( $vip_redirects_array = array(), $append_old_uri = false ) {
	if ( empty( $vip_redirects_array ) )
		return;
	// Don't do anything for the homepage
	if ( '/' == $_SERVER['REQUEST_URI'] )
		return;
	foreach ( $vip_redirects_array as $old_path => $new_url ) {
		if ( substr( $_SERVER['REQUEST_URI'], 0, strlen( $old_path ) ) == $old_path ) {
			if ( $append_old_uri )
				$new_url .= str_replace( $old_path, '', $_SERVER['REQUEST_URI'] );
			wp_redirect( $new_url, 301 );
			exit();
		}
	}