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<?php
namespace WPForms\Helpers;
/**
* WPForms Transients implementation.
*
* @since 1.6.3.1
*/
class Transient {
/**
* Transient option name prefix.
*
* @since 1.6.3.1
*
* @var string
*/
const OPTION_PREFIX = '_wpforms_transient_';
/**
* Transient timeout option name prefix.
*
* @since 1.6.3.1
*
* @var string
*/
const TIMEOUT_PREFIX = '_wpforms_transient_timeout_';
/**
* Get the value of a transient.
*
* If the transient does not exist, does not have a value, or has expired,
* then the return value will be false.
*
* @since 1.6.3.1
*
* @param string $transient Transient name. Expected to not be SQL-escaped.
*
* @return mixed Value of transient.
*/
public static function get( $transient ) {
$transient_option = self::OPTION_PREFIX . $transient;
$transient_timeout = self::TIMEOUT_PREFIX . $transient;
$alloptions = wp_load_alloptions();
// If option is not in alloptions, it is not autoloaded and thus has a timeout to check.
if ( ! isset( $alloptions[ $transient_option ] ) ) {
$is_expired = self::is_expired( $transient );
}
// Return the data if it's not expired.
if ( empty( $is_expired ) ) {
return self::get_option( $transient );
}
delete_option( $transient_option );
delete_option( $transient_timeout );
return false;
}
/**
* Set/update the value of a transient.
*
* You do not need to serialize values. If the value needs to be serialized, then
* it will be serialized before it is set.
*
* @since 1.6.3.1
*
* @param string $transient Transient name. Expected to not be SQL-escaped. Must be
* 164 characters or fewer.
* @param mixed $value Transient value. Must be serializable if non-scalar.
* Expected to not be SQL-escaped.
* @param int $expiration Optional. Time until expiration in seconds. Default 0 (no expiration).
*
* @return bool False if value was not set and true if value was set.
*/
public static function set( $transient, $value, $expiration = 0 ) {
if ( false === self::get_option( $transient ) ) {
return self::add( $transient, $value, $expiration );
}
return self::update( $transient, $value, $expiration );
}
/**
* Create a new transient with a given value.
*
* Internal method, use Transient::set() instead.
*
* @since 1.6.3.1
*
* @param string $transient Transient name. Expected to not be SQL-escaped. Must be
* 164 characters or fewer.
* @param mixed $value Transient value. Must be serializable if non-scalar.
* Expected to not be SQL-escaped.
* @param int $expiration Optional. Time until expiration in seconds. Default 0 (no expiration).
*
* @return bool False if value was not set and true if value was set.
*/
private static function add( $transient, $value, $expiration ) {
if ( $expiration ) {
add_option( self::TIMEOUT_PREFIX . $transient, time() + $expiration, '', 'no' );
}
// If there's an expiration, the option won't be autoloaded.
return add_option( self::OPTION_PREFIX . $transient, $value, '', $expiration ? 'no' : 'yes' );
}
/**
* Update the value of a transient.
*
* Internal method, use Transient::set() instead.
*
* @since 1.6.3.1
*
* @param string $transient Transient name. Expected to not be SQL-escaped. Must be
* 164 characters or fewer.
* @param mixed $value Transient value. Must be serializable if non-scalar.
* Expected to not be SQL-escaped.
* @param int $expiration Optional. Time until expiration in seconds. Default 0 (no expiration).
*
* @return bool False if value was not set and true if value was set.
*/
private static function update( $transient, $value, $expiration ) {
$transient_option = self::OPTION_PREFIX . $transient;
$transient_timeout = self::TIMEOUT_PREFIX . $transient;
if ( ! $expiration ) {
return update_option( $transient_option, $value );
}
$timeout = self::get_timeout( $transient );
if ( false !== $timeout ) {
update_option( $transient_timeout, time() + $expiration );
return update_option( $transient_option, $value );
}
// If expiration is requested, but the transient has no timeout option,
// delete, then re-create transient rather than update.
delete_option( $transient_option );
add_option( $transient_timeout, time() + $expiration, '', 'no' );
return add_option( $transient_option, $value, '', 'no' );
}
/**
* Delete a transient.
*
* @since 1.6.3.1
*
* @param string $transient Transient name. Expected to not be SQL-escaped.
*
* @return bool true if successful, false otherwise
*/
public static function delete( $transient ) {
$result = delete_option( self::OPTION_PREFIX . $transient );
if ( $result ) {
delete_option( self::TIMEOUT_PREFIX . $transient );
}
return $result;
}
/**
* Delete all WPForms transients.
*
* @since 1.6.3.1
*
* @return int|false Number of rows affected/selected or false on error
*/
public static function delete_all() {
global $wpdb;
return $wpdb->query( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->prepare(
"DELETE FROM {$wpdb->options}
WHERE option_name LIKE %s",
$wpdb->esc_like( self::OPTION_PREFIX ) . '%'
)
);
}
/**
* Delete all expired WPForms transients.
*
* The multi-table delete syntax is used to delete the transient record
* from table a, and the corresponding transient_timeout record from table b.
*
* @since 1.6.3.1
*
* @return int|false Number of rows affected/selected or false on error
*/
public static function delete_all_expired() {
global $wpdb;
return $wpdb->query( // phpcs:ignore WordPress.DB.DirectDatabaseQuery.NoCaching
$wpdb->prepare(
"DELETE a, b FROM {$wpdb->options} a, {$wpdb->options} b
WHERE a.option_name LIKE %s
AND a.option_name NOT LIKE %s
AND b.option_name = CONCAT( %s, SUBSTRING( a.option_name, %d ) )
AND b.option_value < %d",
$wpdb->esc_like( self::OPTION_PREFIX ) . '%',
$wpdb->esc_like( self::TIMEOUT_PREFIX ) . '%',
self::TIMEOUT_PREFIX,
strlen( self::OPTION_PREFIX ) + 1,
time()
)
);
}
/**
* Check if transient is expired.
*
* @since 1.6.3.1
*
* @param string $transient Transient name. Expected to not be SQL-escaped.
*
* @return bool true if expired, false otherwise
*/
public static function is_expired( $transient ) {
$timeout = self::get_timeout( $transient );
// If there's no timeout data found, the transient is considered to be valid.
if ( false === $timeout ) {
return false;
}
if ( $timeout >= time() ) {
return false;
}
return true;
}
/**
* Get a transient option value.
*
* @since 1.6.3.1
*
* @param string $transient Transient name. Expected to not be SQL-escaped.
*
* @return mixed Value set for the option.
*/
private static function get_option( $transient ) {
return get_option( self::OPTION_PREFIX . $transient );
}
/**
* Get a transient timeout option value.
*
* @since 1.6.3.1
*
* @param string $transient Transient name. Expected to not be SQL-escaped.
*
* @return mixed Value set for the option.
*/
private static function get_timeout( $transient ) {
return get_option( self::TIMEOUT_PREFIX . $transient );
}
}