php过滤html标签截取部分内容

<?php

$str = '<span>fdsfsdf</span><a href="#">href</a>';

echo htmlspecialchars($str).'<Br>';

echo strip_tags($str);

?>

用strip_tags能把Html标签都去掉，然后调用truncate函数

$array[$row['content_id']]['content_title']=truncate(strip_tags($row['content_title']),21);

function truncate($string,$length,$append = true){

    $string = trim($string);

    $strlength = strlen($string);

    if ($length == 0 || $length >= $strlength){

        return $string;

    }elseif ($length < 0){

        $length = $strlength + $length;

        if ($length < 0)

        {

            $length = $strlength;

        }

    }

    if (function_exists('mb_substr')){

        $newstr = mb_substr($string, 0, $length,"UTF-8");

    }elseif (function_exists('iconv_substr')){

        $newstr = iconv_substr($string, 0, $length,"UTF-8");

    }else{

      for($i=0;$i<$length;$i++){

            $tempstring=substr($string,0,1);

            if(ord($tempstring)>127){

               $i++;

               if($i<$length){

                  $newstring[]=substr($string,0,3);

                  $string=substr($string,3);

               }

            }else{

               $newstring[]=substr($string,0,1);

               $string=substr($string,1);

            }

         }

      $newstr =join($newstring);

    }

    if ($append && $string != $newstr){

        $newstr .= '...';

    }

    return $newstr;

}