get_option

Source code

function get_option( $option, $default = false ) {

	global $wpdb;



	// Allow plugins to short-circuit options.

	$pre = apply_filters( 'pre_option_' . $option, false );

	if ( false !== $pre )

		return $pre;



	$option = trim($option);

	if ( empty($option) )

		return false;



	if ( defined( 'WP_SETUP_CONFIG' ) )

		return false;



	if ( ! defined( 'WP_INSTALLING' ) ) {

		// prevent non-existent options from triggering multiple queries

		$notoptions = wp_cache_get( 'notoptions', 'options' );

		if ( isset( $notoptions[$option] ) )

			return $default;



		$alloptions = wp_load_alloptions();



		if ( isset( $alloptions[$option] ) ) {

			$value = $alloptions[$option];

		} else {

			$value = wp_cache_get( $option, 'options' );



			if ( false === $value ) {

				$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) );



				// Has to be get_row instead of get_var because of funkiness with 0, false, null values

				if ( is_object( $row ) ) {

					$value = $row->option_value;

					wp_cache_add( $option, $value, 'options' );

				} else { // option does not exist, so we must cache its non-existence

					$notoptions[$option] = true;

					wp_cache_set( 'notoptions', $notoptions, 'options' );

					return $default;

				}

			}

		}

	} else {

		$suppress = $wpdb->suppress_errors();

		$row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) );

		$wpdb->suppress_errors( $suppress );

		if ( is_object( $row ) )

			$value = $row->option_value;

		else

			return $default;

	}



	// If home is not set use siteurl.

	if ( 'home' == $option && '' == $value )

		return get_option( 'siteurl' );



	if ( in_array( $option, array('siteurl', 'home', 'category_base', 'tag_base') ) )

		$value = untrailingslashit( $value );



	return apply_filters( 'option_' . $option, maybe_unserialize( $value ) );

}