晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : /home/rainic/www/oldTZh/wp-content/plugins/wp-rocket/inc/classes/traits/trait-memoize.php
<?php
namespace WP_Rocket\Traits;

/**
 * Statically store values.
 *
 * @since  3.3
 */
trait Memoize {

	/**
	 * Store the values.
	 *
	 * @var    array
	 * @since  3.3
	 */
	private static $memoized = [];

	/**
	 * Tell if a value is memoized.
	 *
	 * @since  3.3
	 *
	 * @param  string $method Name of the method.
	 * @param  array  $args   Arguments passed to the parent method. It is used to build a hash.
	 * @return bool
	 */
	final public static function is_memoized( $method, $args = [] ) {
		$hash = self::get_memoize_args_hash( $args );
		return isset( self::$memoized[ $method ][ $hash ] );
	}

	/**
	 * Get a stored value.
	 *
	 * @since  3.3
	 *
	 * @param  string $method Name of the method.
	 * @param  array  $args   Arguments passed to the parent method. It is used to build a hash.
	 * @return mixed
	 */
	final public static function get_memoized( $method, $args = [] ) {
		$hash = self::get_memoize_args_hash( $args );
		return isset( self::$memoized[ $method ][ $hash ] ) ? self::$memoized[ $method ][ $hash ] : null;
	}

	/**
	 * Cache a value.
	 *
	 * @since  3.3
	 *
	 * @param  string $method Name of the method.
	 * @param  array  $args   Arguments passed to the parent method. It is used to build a hash.
	 * @param  mixed  $value  Value to store.
	 * @return mixed          The stored value.
	 */
	final public static function memoize( $method, $args = [], $value = null ) {
		$hash = self::get_memoize_args_hash( $args );

		if ( ! isset( self::$memoized[ $method ] ) ) {
			self::$memoized[ $method ] = [];
		}

		self::$memoized[ $method ][ $hash ] = $value;
		return self::$memoized[ $method ][ $hash ];
	}

	/**
	 * Create a hash based on an array of arguments.
	 *
	 * @since  3.3
	 *
	 * @param  array $args An array of arguments.
	 * @return string
	 */
	private static function get_memoize_args_hash( $args ) {
		if ( [] === $args ) {
			return 'd751713988987e9331980363e24189ce'; // `md5( json_encode( [] ) )`
		}

		return md5( call_user_func( 'json_encode', $args ) );
	}
}

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