ThinkPHP/Library/Org/Util/String.class.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2009 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Org\Util;
class String {

    /**
     * 生成UUID 单机使用
     * @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主键
     * @return Boolean
     */
    static public function keyGen() {
        return str_replace('-','',substr(String::uuid(),1,-1));
    }

    /**
     * 检查字符串是否是UTF8编码
     * @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){