Get WordPress permalink from post, page or custom post type name

get_perm_byname.php

<?php

/**
 * Gets the permalink from the post slug
 * @param string $name the post, page or custom post type slug
 * @param string $p_type the post type
 *
 * @return string The permalink YAHHH!!!
 */
function get_perm_byname( $name, $p_type = 'page' ) {
	global $wpdb;
	$where = $wpdb->prepare( "{$wpdb->posts}.post_type = %s", $p_type  );
	$where .= $wpdb->prepare( " AND {$wpdb->posts}.post_name = %s", $name );
	$id = $wpdb->get_col( "SELECT ID FROM {$wpdb->posts}  WHERE $where" );

		return get_permalink( $id );
}