php截取保留html

	composer @Ta
	2018-09-13 00:04

---

/**
* 字符串切割
* 功能：截取字符串（支持中文），如果字符串中包括html标签，截取的字符串则会保留完整的html标签
* @param string $string 输入字符串
* @param unknown $length    截取长度
* @param bool $mode 截取模式：0删去html标记(默认)，1补齐html标记
* @param string $replace
* @return string
* @author 未来往事<http://blog.fity.cn> 
* 说明：
*   1.未考虑多字节字符，仅已字节做计数单位
*   2.未考虑可单独存在的标记
*/
function html_substr($string, $length, $mode=0, $omit = '......') {
    //先截取指定长度的字符串开始--临时添加
    if (strlen ( $string ) < $length) {
            // $string = substr ( $string, 0 );
            $string = mb_substr($string,0,'',"utf-8");
    } else {
            // $string = substr ( $string, 0, $length );
            $string = mb_substr($string,0,$length,"utf-8");
    }
    //先截取指定长度的字符串结束
    // var_dump($string);die;
    $str= preg_split('/(<!--.*-->|<[^>]*>)/s', $string, -1, PREG_SPLIT_DELIM_CAPTURE);
    foreach($str AS $k => $v) {
        if($v{0} != '<') {
            $length = $length - strlen($v);
            if($length < 0) $str[$k] = mb_substr($v, 0, $length, "utf-8");
        }else{
            $str[$k] = strtolower($v);
        } 
        if($length <= 0){
            break;
        }
    }
    //var_dump($str);die;
    $str = array_slice($str, 0, $k+1);
    $length = count($str);
    foreach($str as $k=>$v) {
        if($v{0} == '<' && $v[1] != '/') {
            $ch = str_replace('<', '</', $v);
            for($i=$k+1; $i<$length && $str[$i]!=$ch; $i++);
            if($i == $length){
                if($mode){
                    if($str[$length] == '</br/>'){
                        $str[$length] = '';
                    }
                    if($ch == '</br/>'){
                        $ch = '';
                    }
                    $str[$length] = $ch . $str[$length];
                }else{
                    $str[$k] = '';
                }
            }
        }
    }
    //var_dump($str);die;
    $str = join('', $str).$omit;
    return $str;
}

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发表于2018-09-13 00:04

#php源码