get_transient()
最后更新于:2021-11-27 03:07:04
get_transient( string$transient)Retrieves the value of a transient.
参数
- $transient
-
(string) (Required) Transient name. Expected to not be SQL-escaped.
响应
(mixed) Value of transient.
源文件
文件: gc-includes/option.php
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.
*
* 响应ing a truthy value from the filter will effectively short-circuit retrieval
* and return the passed 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 ( gc_using_ext_object_cache() ) {
$value = gc_cache_get( $transient, 'transient' );
} else {
$transient_option = '_transient_' . $transient;
if ( ! gc_installing() ) {
// If option is not in alloptions, it is not autoloaded and thus has a timeout.
$alloptions = gc_load_alloptions();
if ( ! isset( $alloptions[ $transient_option ] ) ) {
$transient_timeout = '_transient_timeout_' . $transient;
$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 );
}