将远程相对路径转换为绝对路径

问题描述：

我尝试寻找类似的问题，但未能成功.

I tried looking for a similar question, but was unable to.

我正在寻找正确的方向.我目前正在做的是现在可以收集远程站点的所有href值的列表，因为其中一些可以相对路径，我需要一个构建绝对路径的函数.

I'm looking for push in the right direction. What I'm currently doing is gathering a list of all href values of a remote site, now since some of them can be relative paths, I need a function that builds an absolute path.

由于我拥有域名(通过遵循使用的最后一个URL cUrl):

Since I have the domain name (by following the last url cUrl used):

$base_url = curl_getinfo($ch, CURLINFO_EFFECTIVE_URL);

现在，假设$ base_url的值为: http://www.example.com/home/index.html 我当前正在读取的href值为:/styles/ie.css

Now lets say $base_url value is: http://www.example.com/home/index.html and href value I'm currently reading is: /styles/ie.css

我需要将$ base_url的值更改为 http://www.example.com/样式/ie.css 但是我需要该功能尽可能地动态.看看可能的情况(可能不是全部):

I need to turn the value of $base_url to http://www.example.com/styles/ie.css but I need that function to be dynamic as much as possible. Take a look at the possible scenarios (probably a not all):

1 = base url
2 = relative path
------------------------------------------------
1 http://www.example.com/
2 java/popups.js

1 + 2 = http://www.example.com/java/popups.js
------------------------------------------------
1 http://www.example.com
2 java/popups.js

1 + / + 2 = http://www.example.com/java/popups.js
------------------------------------------------
1 http://www.example.com/mysite/
2 ../java/popups.js 

1 - / + (2 - ..) = http://www.example.com/java/popups.js
------------------------------------------------

1 http://www.example.com/rsc/css/intlhplib-min.css
2 ../images/sunflower.png

1 - /css/intlhplib-min.css + (2 - ..) = http://www.example.com/rsc/images/sunflower.png

答

在@bozdoz向正确的方向推动后，我最终编写了自己的函数.

I ended up writing my own function, after a push in the right direction from @bozdoz.

该函数有两个参数，第一个是$ resource，这是相对文件路径. 第二个是基本网址(将用于构造绝对网址).

The function takes two arguments, first one is $resource, which is the relative file path. And the second one is is the base url (which will be used to construct an absolute url).

这是出于我的项目目的而设计的，我不确定它是否适合正在寻找的人对于类似的解决方案.随时使用它，并提供任何效率方面的改进.

This was design for my project purposes, I'm not sure it will fit anyone who is looking for a similar solution. Feel free to use it, and provide any efficiency improvements.

更新版本:感谢 Tim Cooper

function rel2abs_v2($resource, $base_url) 
{
$base_url = parse_url($base_url);

if(substr($resource, 0, 4) !== "http" && substr($resource, 0, 5) !== "https") // if no http/https is present, then {$resource} is a relative path.
{
# There is a "../" in the string
if (strpos($resource, "../") !== false)
{
$dir_count = substr_count($resource, "../");

$path_array = explode("/", $base_url["path"]);
$path_count = count($path_array); // 4
$path_index = ($path_count - $dir_count) - 2;

$resource = trim(str_replace("../", "", $resource));

if($path_index > 0) { $fs = "/"; }

if($dir_count > 0)
{
$base_url_path = implode("/", array_slice($path_array, $dir_count, $path_index - $dir_count + 1));
return $base_url['scheme'] . '://' . $base_url['host'] . $fs . $base_url_path ."/". $resource;
}
}

# Latest addition - remove if unexplained behaviour is in place.
if(starts_with($resource, "//"))
{
return trim(str_replace("//", "", $resource));      
}

if (starts_with($resource, "/"))
{
return $base_url["scheme"] . "://" . $base_url["host"] . $resource;
}
else
{
$path_array = explode("/", $base_url["path"]);

end($path_array);
$last_id = key($path_array);

return $base_url["scheme"] . "://" . $base_url["host"] . "/" . $path_array[--$last_id] . "/" . $resource;
}

}
else
{
return $resource;
}
}

将远程相对路径转换为绝对路径

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