gistfile1

<?php

		/**
		 * Get a field by its id or slug
		 **/
		public static function get_by( $field, $value ) {
			global $wpdb;

			switch ( $field ) {
				case 'id' :
					$field = 'ID';
					$field_id = $value;
					break;
				case 'slug' :
					$field = 'field_slug';
					$field_id = wp_cache_get( $value, 'rs_registration_fields_slugs' );
					break;
				default:
					return false;
			}

			$fields = false;
			if ( false !== $field_id )
					$fields = wp_cache_get( $field_id, 'rs_registration_fields' ) );

			if ( false === $fields ) {
				$fields = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->rs_registration_fields} WHERE $field = %s", $value ) );

				if ( $fields ) {
					$fields = self::clean_up( $fields );
					self::update_caches( $fields );
				}
			}

			return $fields;
		}