parse_url()

(PHP 4, PHP 5, PHP 7)

解析 URL，返回其组成部分

说明

本函数解析一个 URL 并返回一个关联数组，包含在 URL 中出现的各种组成部分。

本函数不是用来验证给定 URL 的合法性的，只是将其分解为下面列出的部分。不完整的 URL 也被接受，parse_url()会尝试尽量正确地将其解析。

参数

要解析的 URL。无效字符将使用_来替换。

指定PHP_URL_SCHEME、PHP_URL_HOST、PHP_URL_PORT、PHP_URL_USER、PHP_URL_PASS、PHP_URL_PATH、PHP_URL_QUERY或PHP_URL_FRAGMENT的其中一个来获取 URL 中指定的部分的string。（除了指定为PHP_URL_PORT后，将返回一个integer的值）。

返回值

对严重不合格的 URL，parse_url()可能会返回FALSE。

如果省略了$component参数，将返回一个关联数组array，在目前至少会有一个元素在该数组中。数组中可能的键有以下几种：

• scheme-如http
• host
• port
• user
• pass
• path
• query-在问号?之后
• fragment-在散列符号#之后

如果指定了$component参数，parse_url()返回一个string（或在指定为PHP_URL_PORT时返回一个integer）而不是array。如果 URL 中指定的组成部分不存在，将会返回NULL。

更新日志

范例

Example #1parse_url()例子

以上例程会输出：

Array
(
    [scheme] => http
    [host] => hostname
    [user] => username
    [pass] => password
    [path] => /path
    [query] => arg=value
    [fragment] => anchor
)
/path

Example #2parse_url()解析丢失协议的例子

以上例程会输出：

array(3) {
  ["host"]=>
  string(15) "www.example.com"
  ["path"]=>
  string(5) "/path"
  ["query"]=>
  string(17) "googleguy=googley"
}

注释

本函数不能用于相对 URL。Note:

parse_url()是专门用来解析 URL 而不是 URI 的。不过为遵从 PHP 向后兼容的需要有个例外，对 file://协议允许三个斜线（file:///...）。其它任何协议都不能这样。

参见

• pathinfo() 返回文件路径的信息
• parse_str() 将字符串解析成多个变量
• http_build_query() 生成 URL-encode 之后的请求字符串
• http_build_url()
• dirname() 返回路径中的目录部分
• basename() 返回路径中的文件名部分
• » RFC 3986

[If you haven't yet] been able to find a simple conversion back to string from a parsed url, here's an example: 

It may be worth reminding that the value of the #fragment never gets sent to the server. Anchors processing is exclusively client-side.

Here is utf-8 compatible parse_url() replacement function based on "laszlo dot janszky at gmail dot com" work. Original incorrectly handled URLs with user:pass. Also made PHP 5.5 compatible (got rid of now deprecated regex /e modifier). 

I was writing unit tests and needed to cause this function to kick out an error and return FALSE in order to test a specific execution path. If anyone else needs to force a failure, the following inputs will work: 

Created another parse_url utf-8 compatible function. 

Here's a good way to using parse_url () gets the youtube link.
This function I used in many works:

parse_url () allocates a unique youtube code and put into iframe link and displayed on your page. The size of the videos choose yourself.
Enjoy.

Based on the idea of "jbr at ya-right dot com" have I been working on a new function to parse the url:

This returns:
Array
(
  [0] => me:you@sub.site.org:29000/pear/validate.html?happy=me&sad=you#url
  [scheme] => 
  [1] => 
  [login] => me
  [2] => me
  [pass] => you
  [3] => you
  [host] => sub.site.org
  [4] => sub.site.org
  [subdomain] => sub
  [5] => sub
  [domain] => site.org
  [6] => site.org
  [extension] => org
  [7] => org
  [port] => 29000
  [8] => 29000
  [path] => /pear/validate.html
  [9] => /pear/validate.html
  [file] => validate.html
  [10] => validate.html
  [arg] => happy=me&sad=you
  [11] => happy=me&sad=you
  [anchor] => url
  [12] => url
)
So both named and numbered array keys are possible.
It's quite advanced, but I think it works in any case... Let me know if it doesn't...

I have coded a function which converts relative URL to absolute URL for a project of mine. Considering I could not find it elsewhere, I figured I would post it here.
The following function takes in 2 parameters, the first parameter is the URL you want to convert from relative to absolute, and the second parameter is a sample of the absolute URL.
Currently it does not resolve '../' in the URL, only because I do not need it. Most webservers will resolve this for you. If you want it to resolve the '../' in the path, it just takes minor modifications.

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