插件21：把URL相对地址转换为绝对地址

最新推荐文章于 2021-03-16 12:36:16 发布

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本文详细解析了PHP插件RelativeToAbsoluteURL的功能，包括其用途、使用方法及参数说明，帮助开发者理解如何将相对URL转换为绝对URL。

<?php // Plug-in 21: Relative To Absolute URL

// This is an executable example with additional code supplied
// To obtain just the plug-ins please click on the Download link

echo "<font face='Courier New' size='2'><pre>";
$page = "http://site.com/news/current/science/index.html";
$link = "../../prev/tech/roundup.html";
echo "Page: $page<br />Link: $link\n";
echo "Abs:  " . PIPHP_RelToAbsURL($page, $link);

$link = "/sport/index.htm";
echo "\n\nPage: $page<br />Link: $link\n";
echo "Abs:  " . PIPHP_RelToAbsURL($page, $link);

$page = "http://site.com/news/current/science/";
$link = "/sport/index.htm";
echo "\n\nPage: $page<br />Link: $link\n";
echo "Abs:  " . PIPHP_RelToAbsURL($page, $link);

$link = "../../prev/tech/roundup.html";
echo "\n\nPage: $page<br />Link: $link\n";
echo "Abs:  " . PIPHP_RelToAbsURL($page, $link);

function PIPHP_RelToAbsURL($page, $url)
{
   // Plug-in 21: Relative To Absolute URL
   //
   // This plug-in accepts the absolute URL of a web page
   // and a link featured within that page. The link is then
   // turned into an absolute URL which can be independently
   // accessed. Only applies to http:// URLs. The arguments
   // required are:
   //
   //    $page: The web page containing the URL
   //    $url:  The URL to convert to absolute

   if (substr($page, 0, 7) != "http://") return $url;
   
   $parse = parse_url($page);
   $root  = $parse['scheme'] . "://" . $parse['host'];
   $p     = strrpos(substr($page, 7), '/');
   
   if ($p) $base = substr($page, 0, $p + 8);
   else $base = "$page/";
   
   if (substr($url, 0, 1) == '/')           $url = $root . $url;
   elseif (substr($url, 0, 7) != "http://") $url = $base . $url;
   
   return $url;
}

?>

插件说明：

本插件接受一个web也没的URL地址和该页面的一个链接，然后返回这个链接的绝对地址，通过这个地址可以直接访问这个链接页面而无需通过引用页面。简而言之，他返回一个URL绝对地址。本插件需要以下参数：

$page 一个web页面的URL地址，包括”http://"前导符的域名。

$url $page页面上的一个链接。