function DeleteHtml($str) {
    $str = trim ( $str ); // 清除字符串两边的空格
    $str = preg_replace ( "/\t/", "", $str ); // 使用正则表达式匹配需要替换的内容，如空格和换行，并将替换为空
    $str = preg_replace ( "/\r\n/", "", $str );
    $str = preg_replace ( "/\r/", "", $str );
    $str = preg_replace ( "/\n/", "", $str );
    $str = preg_replace ( "/ /", "", $str );
    $str = preg_replace ( "/　/", "", $str ); // 匹配html中的空格
    return trim ( $str ); // 返回字符串
}

function delhtml($content) {
    $content = preg_replace("/<a[^>]*>/i", "", $content);
    $content = preg_replace("/<\/a>/i", "", $content);
    $content = preg_replace("/<div[^>]*>/i", "", $content);
    $content = preg_replace("/<\/div>/i", "", $content);
    $content = preg_replace("/<!--[^>]*-->/i", "", $content); //注释内容
    $content = preg_replace("/style=.+?['|\"]/i", '', $content); //去除样式
    $content = preg_replace("/class=.+?['|\"]/i", '', $content); //去除样式
    $content = preg_replace("/id=.+?['|\"]/i", '', $content); //去除样式
    $content = preg_replace("/lang=.+?['|\"]/i", '', $content); //去除样式
    $content = preg_replace("/width=.+?['|\"]/i", '', $content); //去除样式
    $content = preg_replace("/height=.+?['|\"]/i", '', $content); //去除样式
    $content = preg_replace("/border=.+?['|\"]/i", '', $content); //去除样式
    $content = preg_replace("/face=.+?['|\"]/i", '', $content); //去除样式
    return $content;
}