PHP – 添加链接到字符串中的URL

我有一个功能,将添加< a href>链接前的标签和< / a>之后的链接.但是,对于某些网页而言,它会中断.你如何改善这个功能？谢谢！

function process@R_696_10495@ng($s) 
{
    // check if there is a link

    if(preg_match("/http:\/\//",$s))
    {
        print preg_match("/http:\/\//",$s);


        $startUrl =  @R_696_10495@pos($s,"http://");

        // if the link is in between text
        if(@R_696_10495@pos($s," ",$startUrl)){
            $endUrl = @R_696_10495@pos($s,$startUrl);
        }
        // if link is at the end of @R_696_10495@ng
        else {$endUrl = strlen($s);}

        $beforeUrl = substr($s,$startUrl);
        $url = substr($s,$startUrl,$endUrl-$startUrl);
        $afterUrl = substr($s,$endUrl);

        $new@R_696_10495@ng = $beforeUrl."<a href=\"$url\">".$url."</a>".$afterUrl;

        return $new@R_696_10495@ng;
    }

    return $s;
}

function process@R_696_10495@ng($s) {
    return preg_replace('/https?:\/\/[\w\-\.!~#?&=+\*\'"(),\/]+/','<a href="$0">$0</a>',$s);
}