分享一个PHP 网站SEO及过滤类，方便使用

在给网站页面做ＳＥＯ的时候，长用到得一些函数。 
比如：良好ＵＲＬ生成，用户名过滤，ｅｍａｉｌ检测，截取字符串，全角替换成半角，删除ｈｔｍｌ等 

1. [PHP]代码

<?php
 
class SeoTools
{
    public function friendlyURL($string, $replacement = '-') {
        $map = array(
            '/à|á|å|â|ä/' => 'a',
            '/è|é|ê|ẽ|ë/' => 'e',
            '/ì|í|î/' => 'i',
            '/ò|ó|ô|ø/' => 'o',
            '/ù|ú|ů|û/' => 'u',
            '/ç|č/' => 'c',
            '/ñ|ň/' => 'n',
            '/ľ/' => 'l',
            '/ý/' => 'y',
            '/ť/' => 't',
            '/ž/' => 'z',
            '/š/' => 's',
            '/æ/' => 'ae',
            '/ö/' => 'oe',
            '/ü/' => 'ue',
            '/Ä/' => 'Ae',
            '/Ü/' => 'Ue',
            '/Ö/' => 'Oe',
            '/ß/' => 'ss',
            '/ /'=>' ',
            '/　/'=>'',
       '/～|·|！|@|#|￥|%|…|&|×|（|）|-|\+|=|『|【|』|】|、|:|；|“|”|\'|
       《|，|》|。|？|\/|—|_|：|√|＜|°|丶|＞|－|★|｜|│|‖|ˇ/'=>' ',
            '/[^\w\s\x80-\xff]/' => ' ',
            '/\\s+/' => $replacement
        );
        $string = trim($string);
        $string = preg_replace(array_keys($map), array_values($map), $string);
        $string = preg_replace('/\\s+/',$replacement, strtolower($string));
        $string = trim($string,$replacement);
        return $string;
    }
     
    //判断email
    public function isEmail($mailAddr)
    {
        return strlen($mailAddr) > 6 && preg_match("/^[\w\-\.]+@[\w\-]+(\.\w+)+$/", $mailAddr);
 
    }
    //过滤用户
    public function CheckUser($string,$replacement = '_')
    {
        $map = array(
            '/à|á|å|â|ä/' => 'a',
            '/è|é|ê|ẽ|ë/' => 'e',
            '/ì|í|î/' => 'i',
            '/ò|ó|ô|ø/' => 'o',
            '/ù|ú|ů|û/' => 'u',
            '/ç|č/' => 'c',
            '/ñ|ň/' => 'n',
            '/ľ/' => 'l',
            '/ý/' => 'y',
            '/ť/' => 't',
            '/ž/' => 'z',
            '/š/' => 's',
            '/æ/' => 'ae',
            '/ö/' => 'oe',
            '/ü/' => 'ue',
            '/Ä/' => 'Ae',
            '/Ü/' => 'Ue',
            '/Ö/' => 'Oe',
            '/ß/' => 'ss',
            '/ /'=>' ',
            '/　/'=>'',
            '/～|·|！|@|#|￥|%|…|&|×|（|）|-|\+|=|『|【|』|】|、|:|；|“|”|\'|《|，|》|。
            |？|\/|—|_|：|√|＜|°|丶|＞|－|★|｜|│|‖|ˇ/'=>' ',
            '/[^\w\s\x80-\xff]/' => ' ',
            '/\\s+/' => $replacement
        );
        $string = trim($string);
        $string = preg_replace(array_keys($map), array_values($map), $string);
        $string = preg_replace('/\\s+/',$replacement, strtolower($string));
        $string = trim($string,$replacement);
        return $string;
    }
     
    public function mktitle($string, $replacement = '_')
    {
        $map = array(
            '/à|á|å|â|ä/' => 'a',
            '/è|é|ê|ẽ|ë/' => 'e',
            '/ì|í|î/' => 'i',
            '/ò|ó|ô|ø/' => 'o',
            '/ù|ú|ů|û/' => 'u',
            '/ç|č/' => 'c',
            '/ñ|ň/' => 'n',
            '/ľ/' => 'l',
            '/ý/' => 'y',
            '/ť/' => 't',
            '/ž/' => 'z',
            '/š/' => 's',
            '/æ/' => 'ae',
            '/ö/' => 'oe',
            '/ü/' => 'ue',
            '/Ä/' => 'Ae',
            '/Ü/' => 'Ue',
            '/Ö/' => 'Oe',
            '/ß/' => 'ss',
            '/ /'=>' ',
            '/　/'=>'',
            '/～|·|！|@|#|￥|%|…|&|×|（|）|-|\+|=|『|【|』|】|、|:|；|“|”|\'|《|，|》|。
            |？|\/|—|_|：|√|＜|°|丶|＞|－|★|｜|│|‖|ˇ/'=>' ',
            '/[^\w\s^.\x80-\xff]/' => ' ',
            '/\\s+/' => $replacement
        );
        $string = trim($string);
        $string = preg_replace(array_keys($map), array_values($map), $string);
        $string = preg_replace('/\\s+/',$replacement, strtolower($string));
        $string = trim($string,$replacement);
        return $string;
    }
     
    // 全角替换成半角
    public function Qj2bj($string)
    {
        $qj2bj = array(
            '１' => '1', '２' => '2', '３' => '3', '４' => '4', '５' => '5',
            '６' => '6', '７' => '7', '８' => '8', '９' => '9', '０' => '0',
            'ａ' => 'a', 'ｂ' => 'b', 'ｃ' => 'c', 'ｄ' => 'd', 'ｅ' => 'e',
            'ｆ' => 'f', 'ｇ' => 'g', 'ｈ' => 'h', 'ｉ' => 'i', 'ｊ' => 'j',
            'ｋ' => 'k', 'ｌ' => 'l', 'ｍ' => 'm', 'ｎ' => 'n', 'ｏ' => 'o',
            'ｐ' => 'p', 'ｑ' => 'q', 'ｒ' => 'r', 'ｓ' => 's', 'ｔ' => 't',
            'ｕ' => 'u', 'ｖ' => 'v', 'ｗ' => 'w', 'ｘ' => 'x', 'ｙ' => 'y',
            'ｚ' => 'z', 'Ａ' => 'A', 'Ｂ' => 'B', 'Ｃ' => 'C', 'Ｄ' => 'D',
            'Ｅ' => 'E', 'Ｆ' => 'F', 'Ｇ' => 'G', 'Ｈ' => 'H', 'Ｉ' => 'I',
            'Ｊ' => 'J', 'Ｋ' => 'K', 'Ｌ' => 'L', 'Ｍ' => 'M', 'Ｎ' => 'N',
            'Ｏ' => 'O', 'Ｐ' => 'P', 'Ｑ' => 'Q', 'Ｒ' => 'R', 'Ｓ' => 'S',
            'Ｔ' => 'T', 'Ｕ' => 'U', 'Ｖ' => 'V', 'Ｗ' => 'W', 'Ｘ' => 'X',
            'Ｙ' => 'Y', 'Ｚ' => 'Z', '　' => ' '
        );
        return strtr($string, $qj2bj);
    }
     
    public function DelNbsp($string)
    {
        $map = array(
            '/ /'=>' ',
            '/\?/'=>' ',
            '/　/'=>'',
        );
        $string = preg_replace(array_keys($map), array_values($map), $string);
        $string = preg_replace('/\\s+/','',$string);
        return $string;
    }
    public function getZipcode($str)
    {
        $pattern = "/[0-9]{1}(\d+){4,5}/";
        preg_match_all($pattern,$str,$zipcodeArr); 
        if(empty($zipcodeArr[0]))
        {
            return '';
        }
        else {
            return $zipcodeArr[0][0];
        }
     
    }
 
    public function checkZipcode($str)
    {
        $strwidth=strlen($str);
        $zipcode=$str;
        switch($strwidth)
        {
            case 4:$zipcode="00".$str;break;
            case 5:$zipcode="0".$str;break;
            case 6:$zipcode=$str;break;
            default:$zipcode="";break;
        }
        return $zipcode;
    }
     
    public function getEmail($str) { 
        $pattern = "/\w+([-+.]\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*/i"; 
        preg_match_all($pattern,$str,$emailArr); 
        if(empty($emailArr[0]))
        {
            return '';
        }
        else {
            $email_str=implode(",", $emailArr[0]);
            return $email_str;
        }
    } 
    public function getUrl($str)
    {
        $pattern = "/(http:\/\/|https:\/\/|ftp:\/\/)?([\w:\/\.\?=&-_]+)/is"; 
        preg_match_all($pattern,$str,$urlArr);
        if(empty($urlArr[0]))
        {
            return '';
        }
        else {
            $url_str=implode(",", $urlArr[0]);
            $url_str=preg_replace('/(http:\/\/|https:\/\/|ftp:\/\/)/','',$url_str);
            return $url_str;
        }
 
         
    }
    public function match_links($document) {  
    $match=array();  
       preg_match_all("'<\s*a\s.*?href\s*=\s*([\"\'])?(?(1)(.*?)\\1|([^\s\>]+))[^>]*>?(.*?)
       </a>'isx",$document,$links);                        
       while(list($key,$val) = each($links[2])) {
           if(!empty($val))
               $match['link'][] = $val;
       }
       while(list($key,$val) = each($links[3])) {
           if(!empty($val))
               $match['link'][] = $val;
       }        
       while(list($key,$val) = each($links[4])) {
           if(!empty($val))
               $match['content'][] = $val;
       }
       while(list($key,$val) = each($links[0])) {
           if(!empty($val))
               $match['all'][] = $val;
       }                
       return $match;
    }
    public function DelNoStr($string)
    {
        $map = array(
            '/à|á|å|â|ä/' => 'a',
            '/è|é|ê|ẽ|ë/' => 'e',
            '/ì|í|î/' => 'i',
            '/ò|ó|ô|ø/' => 'o',
            '/ù|ú|ů|û/' => 'u',
            '/ç|č/' => 'c',
            '/ñ|ň/' => 'n',
            '/ľ/' => 'l',
            '/ý/' => 'y',
            '/ť/' => 't',
            '/ž/' => 'z',
            '/š/' => 's',
            '/æ/' => 'ae',
            '/ö/' => 'oe',
            '/ü/' => 'ue',
            '/Ä/' => 'Ae',
            '/Ü/' => 'Ue',
            '/Ö/' => 'Oe',
            '/ß/' => 'ss',
            '/ /'=>' ',
            '/　/'=>'',
            '/～|·|！|@|#|￥|%|…|&|×|（|）|-|\+|=|『|【|』|】|、|:|；|“|”|’|《|，|》|。
            |？|\/|—|_|‘|：|√|＜|°|丶|ˇ/'=>' ',
            '/[^\w\s\x80-\xff]/' => ' ',
           // '/\\s+/' => $replacement
        );
        $string = trim($string);
        $string = preg_replace(array_keys($map), array_values($map), $string);
        $string = preg_replace('/\\s+/','',$string);
        $string = trim($string,'');
        return $string;
    }
    public function UrlToStr($string, $find = '/-/')
    {   
        $string = preg_replace($find," ", strtolower($string));
        $string = trim($string);
        return $string;
    }
     
    public function GetPyLetter($str)
    {
        return substr(pinyin($str, $ucfirst=true), 0,1);
    }
    public function GetPinYin($str)
    {
        return strtolower(pinyin($str, $ucfirst=true));
    }
     
    public function DelCode($str)
    {
         
        $search = array("'<script[^>]*?>.*?</script>'si",    // strip out javascript
                        "'<[\/\!]*?[^<>]*?>'si",            // strip out html tags
                        "'([\r\n])[\s]+'",                  // strip out white space
                        "'&(quot|#34|#034|#x22);'i",        // replace html entities
                        "'&(amp|#38|#038|#x26);'i",         // added hexadecimal values
                        "'&(lt|#60|#060|#x3c);'i",
                        "'&(gt|#62|#062|#x3e);'i",
                        "'&(nbsp|#160|#xa0);'i",
                        "'&(iexcl|#161);'i",
                        "'&(cent|#162);'i",
                        "'&(pound|#163);'i",
                        "'&(copy|#169);'i",
                        "'&(reg|#174);'i",
                        "'&(deg|#176);'i",
                        "'&(#39|#039|#x27);'",
                        "'&(euro|#8364);'i",                // europe
                        "'&a(uml|UML);'",                   // german
                        "'&o(uml|UML);'",
                        "'&u(uml|UML);'",
                        "'&A(uml|UML);'",
                        "'&O(uml|UML);'",
                        "'&U(uml|UML);'",
                        "'ß'i",
                        );
        $replace = array("",
                            "",
                            "\\1",
                            "\"",
                            "&",
                            "<",
                            ">",
                            " ",
                            chr(161),
                            chr(162),
                            chr(163),
                            chr(169),
                            chr(174),
                            chr(176),
                            chr(39),
                            chr(128),
                            "?",
                            "?",
                            "?",
                            "?",
                            "?",
                            "?",
                            "?",
                        );
        $str = preg_replace($search,$replace,$str);
        return trim($str);
    }
     
     
    public function CutStr($sourcestr,$cutlength)
    {
       $returnstr='';
       $i=0;
       $n=0;
       $sourcestr=rtrim(SeoTools::DelCode($sourcestr));
       $str_length=strlen($sourcestr);//字符串的字节数
        while (($n<$cutlength) and ($i<=$str_length))
        {
          $temp_str=substr($sourcestr,$i,1);
          $ascnum=Ord($temp_str);//得到字符串中第$i位字符的ascii码
          if ($ascnum>=224)    //如果ASCII位高与224，
          {
            $returnstr=$returnstr.substr($sourcestr,$i,3); //根据UTF-8编码规范，将3个连续的字符计为单个字符       
             $i=$i+3;            //实际Byte计为3
             $n++;            //字串长度计1
          }
          elseif ($ascnum>=192) //如果ASCII位高与192，
          {
             $returnstr=$returnstr.substr($sourcestr,$i,2); //根据UTF-8编码规范，将2个连续的字符计为单个字符
             $i=$i+2;            //实际Byte计为2
             $n++;            //字串长度计1
          }
          elseif ($ascnum>=65 && $ascnum<=90) //如果是大写字母，
          {
             $returnstr=$returnstr.substr($sourcestr,$i,1);
             $i=$i+1;            //实际的Byte数仍计1个
             $n++;            //但考虑整体美观，大写字母计成一个高位字符
          }
          else                //其他情况下，包括小写字母和半角标点符号，
          {
             $returnstr=$returnstr.substr($sourcestr,$i,1);
             $i=$i+1;            //实际的Byte数计1个
             $n=$n+0.5;        //小写字母和半角标点等与半个高位字符宽...
          }
        }
        if ($str_length>$i){
            $returnstr = $returnstr . ".";//超过长度时在尾处加上省略号
        }
        return htmlspecialchars($returnstr);
    }
     
    public function CreateTagLink($tags_str)
    {
        $tags_array=explode(",",$tags_str);
        $link_tpl="";
        foreach($tags_array as $v)
        {
            $tag=trim($v);
            $alias=SeoTools::friendlyURL($tag);
        //  $link_tpl.='<a href="/s/'.urlencode($alias).'" title="'.$tag.'">'.$tag.'</a>  ';
            $link_tpl.=$tag.'  ';
        }
        return $link_tpl;
    }
     
}
 
 
 
 
/**
 * 中文转拼类
 *
 * @author  Lukin <my@lukin.cn>
 * @date    2011-01-25 10:44
 */
class PinYin {
    // 码表
    private $fp  = null;
    private $dat = 'pinyin.dat';
 
    public function __construct(){
        $this->dat = dirname(__FILE__).'/'.$this->dat;
        if (is_file($this->dat)) {
            $this->fp = fopen($this->dat, 'rb');
        }
    }
    /**
     * 转拼音
     *
     * @param string $str   汉字
     * @param bool $ucfirst 首字母大写
     * @param bool $polyphony 忽略多读音
     * @return string
     */
    public function encode($str, $ucfirst=true, $polyphony=true) {
        $ret = ''; $len = mb_strlen($str, 'UTF-8');
        for ($i = 0; $i < $len; $i++) {
            $py = $this->pinyin(mb_substr($str, $i, 1, 'UTF-8'));
            if ($ucfirst && strpos($py,',') !== false) {
                $pys = explode(',', $py); 
                $ret.= implode(',', array_map('ucfirst', ($polyphony ? array_slice($pys, 0, 1) : $pys)));
            } else {
                $ret.= $ucfirst ? ucfirst($py) : $py;
               
            }
        }
         
        return $ret;
    }
    /**
     * 汉字转十进制
     *
     * @param string $word
     * @return number
     */
    private function char2dec($word) {
        $bins  = '';
        $chars = str_split($word);
        foreach($chars as $char) $bins.= decbin(ord($char));
        $bins = preg_replace('/^.{4}(.{4}).{2}(.{6}).{2}(.{6})$/', '$1$2$3', $bins);
        return bindec($bins);
    }
    /**
     * 单个字转拼音
     *
     * @param string $char  汉字
     * @return string
     */
    public function pinyin($char){
        if (strlen($char) == 3 && $this->fp) {
            $offset = $this->char2dec($char);
            // 判断 off 值
            if ($offset >= 0) {
                fseek($this->fp, ($offset - 19968) << 4, SEEK_SET);
                return trim(fread($this->fp, 16));
            }
        }
        return $char;
    }
 
    public function __destruct() {
        if ($this->fp) {
            fclose($this->fp);
        }
    }
}
/**
 * 取得实例
 *
 * @return $pinyin
 */
function &_pinyin_get_object() {
    static $pinyin;
    if ( is_null($pinyin) )
        $pinyin = new PinYin();
    return $pinyin;
}
 
if (!function_exists('pinyin')) :
/**
 * 取得拼音
 *
 * @param string $str
 * @param bool $ucfirst 首字母大写
 * @return string
 */
function pinyin($str, $ucfirst=true) {
    $py = _pinyin_get_object();
    return $py->encode($str, $ucfirst);
}
endif;

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