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php截取html字符串自动补全html标签

发布时间:2019-08-05 17:09编辑:威尼斯正规官网浏览(99)

     代码如下

    /**
     * 截取HTML,并机关补全闭合
     * @param $html
     * @param $length
     * @param $end
     */
    function subHtml($html,$length) {
     $result = '';
     $tagStack = array();
     $len = 0;

     $contents = preg_split("~(<[^>] ?>)~si",$html, -1,PREG_SPLIT_NO_EMPTY| PREG_SPLIT_DELIM_CAPTURE);
     foreach($contents as $tag)
     {
     if (trim($tag)=="")  continue;
     if(preg_match("~<([a-z0-9] )[^/>]*?/>~si",$tag)){
     $result .= $tag;
     }else if(preg_match("~</([a-z0-9] )[^/>]*?>~si",$tag,$match)){
     if($tagStack[count($tagStack)-1] == $match[1]){
     array_pop($tagStack);
     $result .= $tag;
     }
     }else if(preg_match("~<([a-z0-9] )[^/>]*?>~si",$tag,$match)){
     array_push($tagStack,$match[1]);
     $result .= $tag;
     }else if(preg_match("~<!--.*?-->~si",$tag)){
     $result .= $tag;
     }else{
     if($len mstrlen($tag) < $length){
     $result .= $tag;
     $len = mstrlen($tag);
     }else {
     $str = msubstr($tag,0,$length-$len 1);
     $result .= $str;
     break;
     }

     }
     }
     while(!empty($tagStack)){
     $result .= '</'.array_pop($tagStack).'>';
     }
     return  $result;
    }

    /**
     * 截取普通话字符串
     * @param $string 字符串
     * @param $start 起始位
     * @param $length 长度
     * @param $charset  编码
     * @param $dot 附加字串
     */
    function msubstr($string, $start, $length,$dot='',$charset = 'UTF-8') {
     $string = str_replace(array('&', '"', '<', '>',' '), array('&', '"', '<', '>',' '), $string);
     if(strlen($string) <= $length) {
     return $string;
     }

     if(strtolower($charset) == 'utf-8') {
     $n = $tn = $noc = 0;
     while($n < strlen($string)) {
     $t = ord($string[$n]);
     if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) {
     $tn = 1; $n ;
     } elseif(194 <= $t && $t <= 223) {
     $tn = 2; $n = 2;
     } elseif(224 <= $t && $t <= 239) {
     $tn = 3; $n = 3;
     } elseif(240 <= $t && $t <= 247) {
     $tn = 4; $n = 4;
     } elseif(248 <= $t && $t <= 251) {
     $tn = 5; $n = 5;
     } elseif($t == 252 || $t == 253) {
     $tn = 6; $n = 6;
     } else {
     $n ;
     }
     $noc ;
     if($noc >= $length) {
     break;
     }
     }
     if($noc > $length) {
     $n -= $tn;
     }
     $strcut = substr($string, 0, $n);
     } else {
     for($i = 0; $i < $length; $i ) {
     $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[ $i] : $string[$i];
     }
     }

     return $strcut.$dot;
    }

    /**
     * 猎取字符串的尺寸,包括中爱沙尼亚语。
     */
    function mstrlen($str,$charset = 'UTF-8'){
     if (function_exists('mb_substr')) {
     $length=mb_strlen($str,$charset);
     } elseif (function_exists('iconv_substr')) {
     $length=iconv_strlen($str,$charset);
     } else {
     preg_match_all("/[x01-x7f]|[xc2-xdf][x80-xbf]|xe0[xa0-xbf][x80-xbf]|[xe1-xef][x80-xbf][x80-xbf]|xf0[x90-xbf][x80-xbf][x80-xbf]|[xf1-xf7][x80-xbf][x80-xbf][x80-xbf]/", $text, $ar); 
     $length=count($ar[0]);
     }
     return $length;
    }

    实例

     代码如下

    * @param 要截取的HTML $str
    * @param 截取的多少 $num
    * @param 是还是不是须求丰硕愈来愈多 $more
    * @return 截取串
    */
    function phpos_chsubstr_ahtml($str,$num,$more=false)
    {
        $leng=strlen($str);
          if($num>=$leng)      return $str;
        $word=0;
        $i=0;                        /** 字符串指针 **/
        $stag=array(array());        /** 寄放发轫HTML的标识 **/
        $etag=array(array());        /** 寄存截至HTML的标志 **/
        $sp = 0;
        $ep = 0;
          while($word!=$num)
          {

              if(ord($str[$i])>128)
              {
                //$re.=substr($str,$i,3);
                $i =3;
                $word ;
              }
              else if ($str[$i]=='<')
              {
                  if ($str[$i 1] == '!')
                  {
                    $i ;
                      continue;
                  }

                  if ($str[$i 1]=='/')   
                  {
                    $ptag=&$etag ;
                    $k=&$ep;
                    $i =2;
                  }
                  else                   
                  {
                    $ptag=&$stag;
                    $i =1;
                    $k=&$sp;
                  }

                  for(;$i<$leng;$i )       
                  {
                      if ($str[$i] == ' ')
                      {
                        $ptag[$k] = implode('',$ptag[$k]);
                        $k ;
                          break;
                      }
                      if ($str[$i] != '>')
                      {
                        $ptag[$k][]=$str[$i];
                          continue;
                      }
                      else               
                      {
                        $ptag[$k] = implode('',$ptag[$k]);
                        $k ;
                          break;
                      }
                  }
                $i ;
                  continue;
              }
              else
              {
                //$re.=substr($str,$i,1);
                $word ;
                $i ;
              }
          }
          foreach ($etag as $val)
          {
            $key1=array_search($val,$stag);
              if ($key1 !== false)          unset($stag[$key]);
          }
          foreach ($stag as $key => $val)
          {
              if (in_array($val,array('br','img'))) unset($stag[$key1]);
          }
        array_reverse($stag);
        $ends = '</'.implode('></',$stag).'>';
        $re = substr($str,0,$i).$ends;
          if($more)    $re.='...';
          return $re;
    }

    PHP截取字符串,生成文章摘要
    我们在写BLOG时平时索要出示作品前有个别,不过又怕不确切截断破坏密闭标签以至使整个文书档案结构损坏

      

     代码如下

      function text_zhaiyao($text,$length){ //文摘生成函数  $test:内容 $length:摘要长度
        global $Briefing_Length;
        mb_regex_encoding("UTF-8");
        if(mb_strlen($text) <= $length ) return $text;
        $Foremost = mb_substr($text, 0, $length);
        $re = "<(/?)
        (P|DIV|H1|H2|H3|H4|H5|H6|ADDRESS|PRE|TABLE|TR|TD|TH|INPUT|SELECT|TEXTAREA|OBJECT|A|UL|OL|LI|
        BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT|SPAN)[^>]*(>?)";
        $Single = "/BASE|META|LINK|HR|BR|PARAM|IMG|AREA|INPUT|BR/i";
        
        $Stack = array(); $posStack = array();
        
        mb_ereg_search_init($Foremost, $re, 'i');
        
        while($pos = mb_ereg_search_pos()){
        $match = mb_ereg_search_getregs();
        /* [Child-matching Formulation]:
        
        $matche[1] : A "/" charactor indicating whether current "<...>" Friction is
        Closing Part
        $matche[2] : Element Name.
        $matche[3] : Right > of a "<...>" Friction
        */
        if($match[1]==""){
        $Elem = $match[2];
        if(mb_eregi($Single, $Elem) && $match[3] !=""){
        continue;
        }

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