How to intercept html strings and automatically complete html tags in php, interception and completion_PHP tutorial

How to intercept html string and automatically complete html tags in php, intercept and complete

The example in this article describes how PHP intercepts HTML strings and automatically completes HTML tags. Share it with everyone for your reference. The specific analysis is as follows:

Here is a summary of using php to intercept html strings and automatically complete html tags. In actual development, we often encounter it. Many people directly filter out html tags with strip_tags first, but only plain text is left, which is very readable. Sorry, here is a function, the code is as follows:

Copy code The code is as follows:

/**
* Intercept HTML and automatically complete and close
* @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 .= $tag;
}else if(preg_match("~]*?>~si",$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(!emptyempty($tagStack)){
$result .= '';
}
return $result;
}

/**
* Intercept Chinese string
* @param $string string
* @param $start starting position
* @param $length length
* @param $charset encoding
* @param $dot additional string
​*/
function msubstr($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;
}

/**
* Get the length of the string, including Chinese and English.
​*/
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;
}

Example, the code is as follows:

Copy code The code is as follows:

* @param HTML to be intercepted $str
* @param The number of interceptions $num
* @param Do you need to add more $more
* @return intercept string
*/
function phpos_chsubstr_ahtml($str,$num,$more=false)
{
$leng=strlen($str);
If($num>=$leng)
Return $str;
$word=0;
$i=0; $i=0; /**String pointer **/
$stag=array(array()); /**Stores the flag to start HTML **/
$etag=array(array()); /**Stores the flag that ends the HTML **/
$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 = '';
    $re = substr($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:

复制代码 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
    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;
}

希望本文所述对大家的php程序设计有所帮助。

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