如何使用 PHP 模拟 Stack Overflow 的自动链接行为？

模仿 Stack Overflow 使用 PHP 自动生成链接

Stack Overflow 的用户友好型自动链接功能增强了用户参与度和信息可访问性。本文介绍了受此功能启发的 PHP 函数，可将 URL 无缝转换为超链接内容。

提供的函数利用强大的正则表达式模式来识别 URL。然后，它从 URL 中提取必要的组成部分，例如域和路径。通过截断过长的 URL，保证视觉上美观、简洁。

功能实现：

<code class="php">function auto_link_text($text)
{
    // Daring Fireball's URL-matching regex pattern
    $pattern = '(?i)\b((?:[a-z][\w-]+:(?:/{1,3}|[a-z0-9%])|www\d{0,3}[.]|[a-z0-9.\-]+[.][a-z]{2,4}/)(?:[^\s()<>]+|\(([^\s()<>]+|(\([^\s()<>]+\)))*\))+(?:\(([^\s()<>]+|(\([^\s()<>]+\)))*\)|[^\s`!()\[\]{};:\'".,<>?«»“”‘’]))';

    // Regex callback function for URL processing
    $callback = create_function('$matches', '
        $url       = array_shift($matches);
        $url_parts = parse_url($url);

        $text = parse_url($url, PHP_URL_HOST) . parse_url($url, PHP_URL_PATH);
        $text = preg_replace("/^www./", "", $text);

        $last = -(strlen(strrchr($text, "/"))) + 1;
        if ($last < 0) {
            $text = substr($text, 0, $last) . "&amp;hellip;";
        }

        return sprintf(\'<a rel="nofollow" href="%s">%s</a>\', $url, $text);
    ');

    return preg_replace_callback($pattern, $callback, $text);
}</code>

使用示例：

<code class="php">$input_text = "This is my text.  I wonder if you know about asking questions on StackOverflow:
 Check This out http://www.stackoverflow.com/questions/1925455/how-to-mimic-stackoverflow-auto-link-behavior

 Also, base_convert php function?
http://pt.php.net/manual/en/function.base-convert.php#52450

http://pt.php.net/manual/en/function.base-convert.php?wtf=hehe#52450";

$output_text = auto_link_text($input_text);</code>

输入文本：

This is my text.  I wonder if you know about asking questions on StackOverflow:
Check This out http://www.stackoverflow.com/questions/1925455/how-to-mimic-stackoverflow-auto-link-behavior

Also, base_convert php function?
http://pt.php.net/manual/en/function.base-convert.php#52450

http://pt.php.net/manual/en/function.base-convert.php?wtf=hehe#52450

输出文本：

<code class="html">This is my text.  I wonder if you know about asking questions on StackOverflow:
Check This out <a rel="nofollow" href="http://www.stackoverflow.com/questions/1925455/how-to-mimic-stackoverflow-auto-link-behavior">stackoverflow.com/questions/1925455/&hellip;</a>

Also, base_convert php function?
<a rel="nofollow" href="http://pt.php.net/manual/en/function.base-convert.php#52450">pt.php.net/manual/en/&hellip;</a>

<a rel="nofollow" href="http://pt.php.net/manual/en/function.base-convert.php?wtf=hehe#52450">pt.php.net/manual/en/&hellip;</a></code>

此自定义 PHP 函数有效模拟Stack Overflow 自动链接功能，将 URL 转换为超链接，以增强可读性和用户体验。

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