Retrieves the value of a transient.

Description

If the transient does not exist, does not have a value, or has expired, then the return value will be false.

Parameters

$transientstringrequired

Transient name. Expected to not be SQL-escaped.

Return

More Information

$transient parameter should be 172 characters or less in length as WordPress will prefix your name with “_transient_” or “_transient_timeout_” in the options table (depending on whether it expires or not). Longer key names will silently fail. See Trac #15058.

Returned value is the value of transient. If the transient does not exist, does not have a value, or has expired, then get_transient will return false. This should be checked using the identity operator ( === ) instead of the normal equality operator, because an integer value of zero (or other “empty” data) could be the data you’re wanting to store. Because of this “false” value, transients should not be used to hold plain boolean values. Put them into an array or convert them to integers instead.

Source

function get_transient( $transient ) {

	/**
	 * Filters the value of an existing transient before it is retrieved.
	 *
	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
	 *
	 * Returning a value other than false from the filter will short-circuit retrieval
	 * and return that value instead.
	 *
	 * @since 2.8.0
	 * @since 4.4.0 The `$transient` parameter was added
	 *
	 * @param mixed  $pre_transient The default value to return if the transient does not exist.
	 *                              Any value other than false will short-circuit the retrieval
	 *                              of the transient, and return that value.
	 * @param string $transient     Transient name.
	 */
	$pre = apply_filters( "pre_transient_{$transient}", false, $transient );

	if ( false !== $pre ) {
		return $pre;
	}

	if ( wp_using_ext_object_cache() || wp_installing() ) {
		$value = wp_cache_get( $transient, 'transient' );
	} else {
		$transient_option = '_transient_' . $transient;
		if ( ! wp_installing() ) {
			// If option is not in alloptions, it is not autoloaded and thus has a timeout.
			$alloptions = wp_load_alloptions();

			if ( ! isset( $alloptions[ $transient_option ] ) ) {
				$transient_timeout = '_transient_timeout_' . $transient;
				wp_prime_option_caches( array( $transient_option, $transient_timeout ) );
				$timeout = get_option( $transient_timeout );
				if ( false !== $timeout && $timeout < time() ) {
					delete_option( $transient_option );
					delete_option( $transient_timeout );
					$value = false;
				}
			}
		}

		if ( ! isset( $value ) ) {
			$value = get_option( $transient_option );
		}
	}

	/**
	 * Filters an existing transient's value.
	 *
	 * The dynamic portion of the hook name, `$transient`, refers to the transient name.
	 *
	 * @since 2.8.0
	 * @since 4.4.0 The `$transient` parameter was added
	 *
	 * @param mixed  $value     Value of transient.
	 * @param string $transient Transient name.
	 */
	return apply_filters( "transient_{$transient}", $value, $transient );
}

View all references View on Trac View on GitHub

Hooks

apply_filters( “pre_transient_{$transient}”, mixed $pre_transient, string $transient )

Filters the value of an existing transient before it is retrieved.

apply_filters( “transient_{$transient}”, mixed $value, string $transient )

Filters an existing transient’s value.

Changelog