class String {    /**     +----------------------------------------------------------     * 生成UUID 單機使用     +----------------------------------------------------------     * @access public     +----------------------------------------------------------     * @return string     +----------------------------------------------------------     */    static public function uuid() {        $charid = md5(uniqid(mt_rand(), true));        $hyphen = chr(45);// "-"        $uuid = chr(123)// "{"               .substr($charid, 0, 8).$hyphen               .substr($charid, 8, 4).$hyphen               .substr($charid,12, 4).$hyphen               .substr($charid,16, 4).$hyphen               .substr($charid,20,12)               .chr(125);// "}"        return $uuid;   }	/**	 +----------------------------------------------------------	 * 生成Guid主鍵	 +----------------------------------------------------------	 * @return Boolean	 +----------------------------------------------------------	 */	static public function keyGen() {		return str_replace('-','',substr(String::uuid(),1,-1));	}	/**	 +----------------------------------------------------------	 * 檢查字符串是否是UTF8編碼	 +----------------------------------------------------------	 * @param string $string 字符串	 +----------------------------------------------------------	 * @return Boolean	 +----------------------------------------------------------	 */	static public function isUtf8($str) {		$c=0; $b=0;		$bits=0;		$len=strlen($str);		for($i=0; $i<$len; $i++){			$c=ord($str[$i]);			if($c > 128){				if(($c >= 254)) return false;				elseif($c >= 252) $bits=6;				elseif($c >= 248) $bits=5;				elseif($c >= 240) $bits=4;				elseif($c >= 224) $bits=3;				elseif($c >= 192) $bits=2;				else return false;				if(($i+$bits) > $len) return false;				while($bits > 1){					$i++;					$b=ord($str[$i]);					if($b < 128 || $b > 191) return false;					$bits--;				}			}		}		return true;	}	/**	 +----------------------------------------------------------	 * 字符串截取，支持中文和其他編碼	 +----------------------------------------------------------	 * @static	 * @access public	 +----------------------------------------------------------	 * @param string $str 需要轉(zhuǎn)換的字符串	 * @param string $start 開始位置	 * @param string $length 截取長度	 * @param string $charset 編碼格式	 * @param string $suffix 截斷顯示字符	 +----------------------------------------------------------	 * @return string	 +----------------------------------------------------------	 */	static public function msubstr($str, $start=0, $length, $charset="utf-8", $suffix=true) {        if(function_exists("mb_substr"))            $slice = mb_substr($str, $start, $length, $charset);        elseif(function_exists('iconv_substr')) {            $slice = iconv_substr($str,$start,$length,$charset);        }else{            $re['utf-8']   = "/[\x01-\x7f]|[\xc2-\xdf][\x80-\xbf]|[\xe0-\xef][\x80-\xbf]{2}|[\xf0-\xff][\x80-\xbf]{3}/";            $re['gb2312'] = "/[\x01-\x7f]|[\xb0-\xf7][\xa0-\xfe]/";            $re['gbk']    = "/[\x01-\x7f]|[\x81-\xfe][\x40-\xfe]/";            $re['big5']   = "/[\x01-\x7f]|[\x81-\xfe]([\x40-\x7e]|\xa1-\xfe])/";            preg_match_all($re[$charset], $str, $match);            $slice = join("",array_slice($match[0], $start, $length));        }        return $suffix ? $slice.'...' : $slice;    }	/**	 +----------------------------------------------------------	 * 產(chǎn)生隨機字串，可用來自動生成密碼	 * 默認長度6位 字母和數(shù)字混合 支持中文	 +----------------------------------------------------------	 * @param string $len 長度	 * @param string $type 字串類型	 * 0 字母 1 數(shù)字 其它 混合	 * @param string $addChars 額外字符	 +----------------------------------------------------------	 * @return string	 +----------------------------------------------------------	 */	static public function randString($len=6,$type='',$addChars='') {		$str ='';		switch($type) {			case 0:				$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'.$addChars;				break;			case 1:				$chars= str_repeat('0123456789',3);				break;			case 2:				$chars='ABCDEFGHIJKLMNOPQRSTUVWXYZ'.$addChars;				break;			case 3:				$chars='abcdefghijklmnopqrstuvwxyz'.$addChars;				break;			case 4:				$chars = "們阿斯頓發(fā)生地方阿斯蒂芬阿斯蒂芬ASF地V字形陳V手勢地方過水電費v鬼地方乖寶寶雙方都 山東飯館山東飯館撒地方v睡的地方改水電費撒地方感受到法國地神風怪盜搞活動大發(fā)光火地方館地方高大發(fā)光火的反光板的廣播臺地方館別DVB大小分割撒地方 啥地方告訴對方釋放掉豆沙方糕撒地方干點啥風格白癜風鍋煽豆腐山東飯館時代復分高速鋼微軟消費稅大發(fā)光火好的銹掃畢璃寶芯爺鑒秘凈蔣鈣肩騰枯拋軌堂拌爸循誘祝勵肯酒繩窮塘燥泡袋朗喂鋁軟渠顆慣貿(mào)糞綜墻趨彼屆墨礙啟逆卸航衣孫齡嶺騙休借".$addChars;				break;			default :				// 默認去掉了容易混淆的字符oOLl和數(shù)字01，要添加請使用addChars參數(shù)				$chars='ABCDEFGHIJKMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789'.$addChars;				break;		}		if($len>10 ) {//位數(shù)過長重復字符串一定次數(shù)			$chars= $type==1? str_repeat($chars,$len) : str_repeat($chars,5);		}		if($type!=4) {			$chars   =   str_shuffle($chars);			$str     =   substr($chars,0,$len);		}else{			// 中文隨機字			for($i=0;$i<$len;$i++){			  $str.= self::msubstr($chars, floor(mt_rand(0,mb_strlen($chars,'utf-8')-1)),1,'utf-8',false);			}		}		return $str;	}	/**	 +----------------------------------------------------------	 * 生成一定數(shù)量的隨機數(shù)，并且不重復	 +----------------------------------------------------------	 * @param integer $number 數(shù)量	 * @param string $len 長度	 * @param string $type 字串類型	 * 0 字母 1 數(shù)字 其它 混合	 +----------------------------------------------------------	 * @return string	 +----------------------------------------------------------	 */	static public function buildCountRand ($number,$length=4,$mode=1) {			if($mode==1 && $length<strlen($number) ) {				//不足以生成一定數(shù)量的不重復數(shù)字				return false;			}			$rand   =  array();			for($i=0; $i<$number; $i++) {				$rand[] =   self::randString($length,$mode);			}			$unqiue = array_unique($rand);			if(count($unqiue)==count($rand)) {				return $rand;			}			$count   = count($rand)-count($unqiue);			for($i=0; $i<$count*3; $i++) {				$rand[] =   self::randString($length,$mode);			}			$rand = array_slice(array_unique ($rand),0,$number);			return $rand;	}	/**	 +----------------------------------------------------------	 *  帶格式生成隨機字符 支持批量生成	 *  但可能存在重復	 +----------------------------------------------------------	 * @param string $format 字符格式	 *     # 表示數(shù)字 * 表示字母和數(shù)字 $ 表示字母	 * @param integer $number 生成數(shù)量	 +----------------------------------------------------------	 * @return string | array	 +----------------------------------------------------------	 */	static public function buildFormatRand($format,$number=1) {		$str  =  array();		$length =  strlen($format);		for($j=0; $j<$number; $j++) {			$strtemp   = '';			for($i=0; $i<$length; $i++) {				$char = substr($format,$i,1);				switch($char){					case "*"://字母和數(shù)字混合						$strtemp   .= String::randString(1);						break;					case "#"://數(shù)字						$strtemp  .= String::randString(1,1);						break;					case "$"://大寫字母						$strtemp .=  String::randString(1,2);						break;					default://其他格式均不轉(zhuǎn)換						$strtemp .=   $char;						break;			   }			}			$str[] = $strtemp;		}		return $number==1? $strtemp : $str ;	}	/**	 +----------------------------------------------------------	 * 獲取一定范圍內(nèi)的隨機數(shù)字 位數(shù)不足補零	 +----------------------------------------------------------	 * @param integer $min 最小值	 * @param integer $max 最大值	 +----------------------------------------------------------	 * @return string	 +----------------------------------------------------------	 */	static public function randNumber ($min, $max) {		return sprintf("%0".strlen($max)."d", mt_rand($min,$max));	}    // 自動轉(zhuǎn)換字符集 支持數(shù)組轉(zhuǎn)換    static public function autoCharset($string, $from='gbk', $to='utf-8') {        $from = strtoupper($from) == 'UTF8' ? 'utf-8' : $from;        $to = strtoupper($to) == 'UTF8' ? 'utf-8' : $to;        if (strtoupper($from) === strtoupper($to) || empty($string) || (is_scalar($string) && !is_string($string))) {            //如果編碼相同或者非字符串標量則不轉(zhuǎn)換            return $string;        }        if (is_string($string)) {            if (function_exists('mb_convert_encoding')) {                return mb_convert_encoding($string, $to, $from);            } elseif (function_exists('iconv')) {                return iconv($from, $to, $string);            } else {                return $string;            }        } elseif (is_array($string)) {            foreach ($string as $key => $val) {                $_key = self::autoCharset($key, $from, $to);                $string[$_key] = self::autoCharset($val, $from, $to);                if ($key != $_key)                    unset($string[$key]);            }            return $string;        }        else {            return $string;        }    }}

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