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。 sh-3ll

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<?php
/**
* LiteSpeed String Operator Library Class
*
* @since 1.3
*/
namespace LiteSpeed;

defined( 'WPINC' ) || exit;

class Str {

	/**
	 * Generate random string
	 *
	 * @since  1.3
	 * @access public
	 * @param  int  $len  	 Length of string
	 * @param  int  $type    1-Number 2-LowerChar 4-UpperChar
	 * @return string
	 */
	public static function rrand( $len, $type = 7 ) {
		mt_srand( ( double ) microtime() * 1000000 );

		switch( $type ) {
			case 0 :
				$charlist = '012';
				break;

			case 1 :
				$charlist = '0123456789';
				break;

			case 2 :
				$charlist = 'abcdefghijklmnopqrstuvwxyz';
				break;

			case 3 :
				$charlist = '0123456789abcdefghijklmnopqrstuvwxyz';
				break;

			case 4 :
				$charlist = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
				break;

			case 5 :
				$charlist = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ';
				break;

			case 6 :
				$charlist = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
				break;

			case 7 :
				$charlist = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
				break;

		}

		$str = '';

		$max = strlen( $charlist ) - 1;
		for( $i = 0; $i < $len; $i++ ) {
			$str .= $charlist[ mt_rand( 0, $max ) ];
		}

		return $str;
	}


}