set_site_transient()
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概述
set_site_transient() 函数用于设置或更新站点瞬态(site transient)的值,支持设置过期时间。该函数会自动处理值的序列化,并包含多个钩子(Hook)用于自定义行为。
关键要点
- 函数用于设置站点瞬态,适用于多站点环境中的缓存数据存储。
- 参数包括瞬态名称($transient,字符串,长度不超过167字符)、值($value,混合类型)和过期时间($expiration,整数,默认0表示永不过期)。
- 返回值是布尔值:成功设置返回 true,否则返回 false。
- 函数内部使用 apply_filters 钩子(如 pre_set_site_transient_{$transient} 和 expiration_of_site_transient_{$transient})允许在设置前过滤值和过期时间。
- 根据是否使用外部对象缓存或安装模式,函数通过 wp_cache_set() 或 add_site_option()/update_site_option() 实现存储。
- 设置成功后,会触发 do_action 钩子(如 set_site_transient_{$transient} 和 set_site_transient),并包含一个已弃用的钩子 setted_site_transient。
代码示例
// 设置一个站点瞬态,过期时间为1小时(3600秒)
$result = set_site_transient( 'my_transient_key', 'some_value', 3600 );
if ( $result ) {
echo '瞬态设置成功';
} else {
echo '瞬态设置失败';
}注意事项
- 瞬态名称不应进行 SQL 转义,且长度限制为167字符以内。
- 值会自动序列化,无需手动处理。
- 过期时间以秒为单位,设置为0表示永不过期。
- 函数在 WordPress 2.9.0 版本引入,适用于多站点环境。
- 注意钩子的动态部分(如 {$transient})允许针对特定瞬态进行过滤和操作。
原文内容
Sets/updates the value of a site transient.
Description
You do not need to serialize values. If the value needs to be serialized, then it will be serialized before it is set.
See also
Parameters
$transientstringrequired-
Transient name. Expected to not be SQL-escaped. Must be 167 characters or fewer in length.
$valuemixedrequired-
Transient value. Expected to not be SQL-escaped.
$expirationintoptional-
Time until expiration in seconds. Default 0 (no expiration).
Source
function set_site_transient( $transient, $value, $expiration = 0 ) {
/**
* Filters the value of a specific site transient before it is set.
*
* The dynamic portion of the hook name, `$transient`, refers to the transient name.
*
* @since 3.0.0
* @since 4.4.0 The `$transient` parameter was added.
*
* @param mixed $value New value of site transient.
* @param string $transient Transient name.
*/
$value = apply_filters( "pre_set_site_transient_{$transient}", $value, $transient );
$expiration = (int) $expiration;
/**
* Filters the expiration for a site transient before its value is set.
*
* The dynamic portion of the hook name, `$transient`, refers to the transient name.
*
* @since 4.4.0
*
* @param int $expiration Time until expiration in seconds. Use 0 for no expiration.
* @param mixed $value New value of site transient.
* @param string $transient Transient name.
*/
$expiration = apply_filters( "expiration_of_site_transient_{$transient}", $expiration, $value, $transient );
if ( wp_using_ext_object_cache() || wp_installing() ) {
$result = wp_cache_set( $transient, $value, 'site-transient', $expiration );
} else {
$transient_timeout = '_site_transient_timeout_' . $transient;
$option = '_site_transient_' . $transient;
wp_prime_site_option_caches( array( $option, $transient_timeout ) );
if ( false === get_site_option( $option ) ) {
if ( $expiration ) {
add_site_option( $transient_timeout, time() + $expiration );
}
$result = add_site_option( $option, $value );
} else {
if ( $expiration ) {
update_site_option( $transient_timeout, time() + $expiration );
}
$result = update_site_option( $option, $value );
}
}
if ( $result ) {
/**
* Fires after the value for a specific site transient has been set.
*
* The dynamic portion of the hook name, `$transient`, refers to the transient name.
*
* @since 3.0.0
* @since 4.4.0 The `$transient` parameter was added
*
* @param mixed $value Site transient value.
* @param int $expiration Time until expiration in seconds.
* @param string $transient Transient name.
*/
do_action( "set_site_transient_{$transient}", $value, $expiration, $transient );
/**
* Fires after the value for a site transient has been set.
*
* @since 6.8.0
*
* @param string $transient The name of the site transient.
* @param mixed $value Site transient value.
* @param int $expiration Time until expiration in seconds.
*/
do_action( 'set_site_transient', $transient, $value, $expiration );
/**
* Fires after the value for a site transient has been set.
*
* @since 3.0.0
* @deprecated 6.8.0 Use 'set_site_transient' instead.
*
* @param string $transient The name of the site transient.
* @param mixed $value Site transient value.
* @param int $expiration Time until expiration in seconds.
*/
do_action_deprecated( 'setted_site_transient', array( $transient, $value, $expiration ), '6.8.0', 'set_site_transient' );
}
return $result;
}
Hooks
- apply_filters( “expiration_of_site_transient_{$transient}”, int $expiration, mixed $value, string $transient )
-
Filters the expiration for a site transient before its value is set.
- apply_filters( “pre_set_site_transient_{$transient}”, mixed $value, string $transient )
-
Filters the value of a specific site transient before it is set.
- do_action_deprecated( ‘setted_site_transient’, string $transient, mixed $value, int $expiration )
-
Fires after the value for a site transient has been set.
- do_action( ‘set_site_transient’, string $transient, mixed $value, int $expiration )
-
Fires after the value for a site transient has been set.
- do_action( “set_site_transient_{$transient}”, mixed $value, int $expiration, string $transient )
-
Fires after the value for a specific site transient has been set.
Changelog
| Version | Description |
|---|---|
| 2.9.0 | Introduced. |