如何使用php将textarea中的链接转换为link-element？

我正在创建一个脚本,它包含一个发布脚本但我希望用户直接从其他任何地方复制链接,当他们发布链接文本时,链接文本应自动将链接转换为link-element(< a>).

所以例如：

Ask this on https://stackoverflow.com Now

成为

Ask this on <a href="https://stackoverflow.com">https://stackoverflow.com</a> Now

我已经尝试过str_replace()函数,但它不是解决方案.

谁能告诉我这个解决方案？

解决方法:

有几种解决方案,其中大部分都是写得不好而且不完整.在这种情况下,我建议使用一个已经存在的大框架解决方案,没有必要重新发明轮子.

例如,this article on Zenverse描述了WordPress处理此问题的方式.

让我在这里添加片段以供进一步参考：

function _make_url_clickable_cb($matches) {
    $ret = '';
    $url = $matches[2];

    if ( empty($url) )
        return $matches[0];
    // removed trailing [.,;:] from URL
    if ( in_array(substr($url, -1), array('.', ',', ';', ':')) === true ) {
        $ret = substr($url, -1);
        $url = substr($url, 0, strlen($url)-1);
    }
    return $matches[1] . "<a href=\"$url\" rel=\"nofollow\">$url</a>" . $ret;
}

function _make_web_ftp_clickable_cb($matches) {
    $ret = '';
    $dest = $matches[2];
    $dest = 'http://' . $dest;

    if ( empty($dest) )
        return $matches[0];
    // removed trailing [,;:] from URL
    if ( in_array(substr($dest, -1), array('.', ',', ';', ':')) === true ) {
        $ret = substr($dest, -1);
        $dest = substr($dest, 0, strlen($dest)-1);
    }
    return $matches[1] . "<a href=\"$dest\" rel=\"nofollow\">$dest</a>" . $ret;
}

function _make_email_clickable_cb($matches) {
    $email = $matches[2] . '@' . $matches[3];
    return $matches[1] . "<a href=\"mailto:$email\">$email</a>";
}

function make_clickable($ret) {
    $ret = ' ' . $ret;
    // in testing, using arrays here was found to be faster
    $ret = preg_replace_callback('#([\s>])([\w]+?://[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_url_clickable_cb', $ret);
    $ret = preg_replace_callback('#([\s>])((www|ftp)\.[\w\\x80-\\xff\#$%&~/.\-;:=,?@\[\]+]*)#is', '_make_web_ftp_clickable_cb', $ret);
    $ret = preg_replace_callback('#([\s>])([.0-9a-z_+-]+)@(([0-9a-z-]+\.)+[0-9a-z]{2,})#i', '_make_email_clickable_cb', $ret);

    // this one is not in an array because we need it to run last, for cleanup of accidental links within links
    $ret = preg_replace("#(<a( [^>]+?>|>))<a [^>]+?>([^>]+?)</a></a>#i", "$1$3</a>", $ret);
    $ret = trim($ret);
    return $ret;
}

链接文章中编写的示例用法：

$string = 'I have some texts here and also links such as http://www.youtube.com , www.haha.com and [e-mail]. They are ready to be replaced.';

echo make_clickable($string);