php截取html字符串及自动补全html标签的方法_PHP

本文实例讲述了php截取html字符串及自动补全html标签的方法。分享给大家供大家参考。具体分析如下：

这里总结一下关于利用php截取html字符串自动补全html标签,实际开发中会经常碰到,很多人直接先strip_tags过滤掉html标签,但是就只剩下纯文本了,可读性非常差,下面是一个函数,代码如下:

/** <br /> * 截取HTML,并自动补全闭合 <br /> * @param $html <br /> * @param $length <br /> * @param $end <br /> */ <br />function subHtml($html,$length) { <br /> $result = ''; <br /> $tagStack = array(); <br /> $len = 0; <br /> <br /> $contents = preg_split("~(]+?>)~si",$html, -1,PREG_SPLIT_NO_EMPTY| PREG_SPLIT_DELIM_CAPTURE); <br /> foreach($contents as $tag) <br /> { <br /> if (trim($tag)=="")  continue; <br /> if(preg_match("~]*?/>~si",$tag)){ <br /> $result .= $tag; <br /> }else if(preg_match("~]*?>~si",$tag,$match)){ <br /> if($tagStack[count($tagStack)-1] == $match[1]){ <br /> array_pop($tagStack); <br /> $result .= $tag; <br /> } <br /> }else if(preg_match("~]*?>~si",$tag,$match)){ <br /> array_push($tagStack,$match[1]); <br /> $result .= $tag; <br /> }else if(preg_match("~<!---ecms -ecms -ecms .*?-->~si",$tag)){ <br /> $result .= $tag; <br /> }else{ <br /> if($len + mstrlen($tag) < $length){ <br /> $result .= $tag; <br /> $len += mstrlen($tag);  <br /> }else { <br /> $str = msubstr($tag,0,$length-$len+1); <br /> $result .= $str; <br /> break; <br /> } <br /> <br /> } <br /> } <br /> while(!emptyempty($tagStack)){ <br /> $result .= ''; <br /> } <br /> return  $result; <br />} <br /> <br />/** <br /> * 截取中文字符串 <br /> * @param $string 字符串 <br /> * @param $start 起始位 <br /> * @param $length 长度 <br /> * @param $charset  编码 <br /> * @param $dot 附加字串 <br /> */ <br />function msubstr($string, $start, $length,$dot='',$charset = 'UTF-8') { <br /> $string = str_replace(array('&', '"', '',' '), array('&', '"', '',' '), $string); <br /> if(strlen($string) <= $length) { <br /> return $string; <br /> } <br /> <br /> if(strtolower($charset) == 'utf-8') { <br /> $n = $tn = $noc = 0; <br /> while($n < strlen($string)) { <br /> $t = ord($string[$n]); <br /> if($t == 9 || $t == 10 || (32 <= $t && $t <= 126)) { <br /> $tn = 1; $n++; <br /> } elseif(194 <= $t && $t <= 223) { <br /> $tn = 2; $n += 2; <br /> } elseif(224 <= $t && $t <= 239) { <br /> $tn = 3; $n += 3; <br /> } elseif(240 <= $t && $t <= 247) { <br /> $tn = 4; $n += 4; <br /> } elseif(248 <= $t && $t <= 251) { <br /> $tn = 5; $n += 5; <br /> } elseif($t == 252 || $t == 253) { <br /> $tn = 6; $n += 6; <br /> } else { <br /> $n++; <br /> } <br /> $noc++; <br /> if($noc >= $length) { <br /> break; <br /> } <br /> } <br /> if($noc > $length) { <br /> $n -= $tn; <br /> } <br /> $strcut = substr($string, 0, $n); <br /> } else { <br /> for($i = 0; $i < $length; $i++) { <br /> $strcut .= ord($string[$i]) > 127 ? $string[$i].$string[++$i] : $string[$i]; <br /> } <br /> } <br /> <br /> return $strcut.$dot; <br />} <br /> <br />/** <br /> * 取得字符串的长度，包括中英文。 <br /> */ <br />function mstrlen($str,$charset = 'UTF-8'){ <br /> if (function_exists('mb_substr')) { <br /> $length=mb_strlen($str,$charset); <br /> } elseif (function_exists('iconv_substr')) { <br /> $length=iconv_strlen($str,$charset); <br /> } else {<br /> 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);   <br /> $length=count($ar[0]); <br /> } <br /> return $length; <br />}

实例,代码如下:

* @param 要截取的HTML $str <br />* @param 截取的数量 $num <br />* @param 是否需要加上更多 $more <br />* @return 截取串 <br />*/ <br />function phpos_chsubstr_ahtml($str,$num,$more=false) <br />{ <br />    $leng=strlen($str); <br />      if($num>=$leng)<br />      return $str; <br />    $word=0; <br />    $i=0;                        /** 字符串指针 **/ <br />    $stag=array(array());        /** 存放开始HTML的标志 **/ <br />    $etag=array(array());        /** 存放结束HTML的标志 **/ <br />    $sp = 0; <br />    $ep = 0; <br />      while($word!=$num) <br />      { <br />          if(ord($str[$i])>128) <br />          { <br />            //$re.=substr($str,$i,3); <br />            $i+=3; <br />            $word++; <br />          } <br />          else if ($str[$i]=='<') <br />          { <br />              if ($str[$i+1] == '!') <br />              { <br />                $i++; <br />                  continue; <br />              } <br /> <br />              if ($str[$i+1]=='/')     <br />              { <br />                $ptag=&$etag ; <br />                $k=&$ep; <br />                $i+=2; <br />              } <br />              else                     <br />              { <br />                $ptag=&$stag; <br />                $i+=1; <br />                $k=&$sp; <br />              } <br /> <br />              for(;$i<$leng;$i++)         <br />              { <br />                  if ($str[$i] == ' ') <br />                  { <br />                    $ptag[$k] = implode('',$ptag[$k]); <br />                    $k++; <br />                      break; <br />                  } <br />      <mark style="color:transparent">来4源gaodaimacom搞#代%码*网</mark><code>搞代gaodaima码</code>            if ($str[$i] != '>')  <br />                  { <br />                    $ptag[$k][]=$str[$i]; <br />                      continue; <br />                  } <br />                  else                 <br />                  { <br />                    $ptag[$k] = implode('',$ptag[$k]); <br />                    $k++; <br />                      break; <br />                  } <br />              } <br />            $i++; <br />              continue; <br />          } <br />          else <br />          { <br />            //$re.=substr($str,$i,1); <br />            $word++; <br />            $i++; <br />          } <br />      } <br />      foreach ($etag as $val) <br />      { <br />        $key1=array_search($val,$stag); <br />          if ($key1 !== false)          unset($stag[$key]); <br />      } <br />      foreach ($stag as $key => $val) <br />      { <br />          if (in_array($val,array('br','img'))) unset($stag[$key1]); <br />      } <br />    array_reverse($stag); <br />    $ends = ''; <br />    $re = substr($str,0,$i).$ends; <br />      if($more)    $re.='...'; <br />      return $re; <br />}

PHP截取字符串,生成文章摘要,我们在写BLOG时经常需要显示文章前一部分,但是又怕不恰当截断破坏封闭标签以造成整个文档结构破坏,代码如下:

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

希望本文所述对大家的php程序设计有所帮助。

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