class String {    /**     +----------------------------------------------------------     * 生成UUID 單機(jī)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 $suffix 截?cái)囡@示字符	 +----------------------------------------------------------	 * @return string	 +----------------------------------------------------------	 */	static public function msubstr($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(jī)字串，可用來自動(dòng)生成密碼	 * 默認(rèn)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:				$chars = "們阿斯頓發(fā)生地方阿斯蒂芬阿斯蒂芬ASF地V字形陳V手勢(shì)地方過水電費(fèi)v鬼地方乖寶寶雙方都 山東飯館山東飯館撒地方v睡的地方改水電費(fèi)撒地方感受到法國地神風(fēng)怪盜搞活動(dòng)大發(fā)光火地方館地方高大發(fā)光火的反光板的廣播臺(tái)地方館別DVB大小分割撒地方 啥地方告訴對(duì)方釋放掉豆沙方糕撒地方干點(diǎn)啥風(fēng)格白癜風(fēng)鍋煽豆腐山東飯館時(shí)代復(fù)分高速鋼微軟消費(fèi)稅大發(fā)光火好的銹掃畢璃寶芯爺鑒秘凈蔣鈣肩騰枯拋軌堂拌爸循誘祝勵(lì)肯酒繩窮塘燥泡袋朗喂鋁軟渠顆慣貿(mào)糞綜墻趨彼屆墨礙啟逆卸航衣孫齡嶺騙休借".$addChars;				break;			default :				// 默認(rèn)去掉了容易混淆的字符oOLl和數(shù)字01，要添加請(qǐng)使用addChars參數(shù)				$chars='ABCDEFGHIJKMNPQRSTUVWXYZabcdefghijkmnpqrstuvwxyz23456789'.$addChars;				break;		}		if($len>10 ) {//位數(shù)過長重復(fù)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,$len);		}else{			// 中文隨機(jī)字			for($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(jī)數(shù)，并且不重復(fù)	 +----------------------------------------------------------	 * @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(fù)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(jī)字符 支持批量生成	 *  但可能存在重復(fù)	 +----------------------------------------------------------	 * @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(jī)數(shù)字 位數(shù)不足補(bǔ)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(dòng)轉(zhuǎn)換字符集 支持?jǐn)?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(biāo)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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