Documentation: php.net link review

Reviewed all links, both in user facing documentation as well as in code documentation, for:
* Use of `https`
* Use of `www` (saves a redirect)
* Use of language agnostic permalinks as per https://www.php.net/urlhowto.php

Fixes 480

README.md

@@ -14,7 +14,7 @@ the new BSD license) and has no dependencies, except for PHP 5.6+.
 
 Despite PHP's use as a language for the web, its tools for sending HTTP requests
 are severely lacking. cURL has an
-[interesting API](http://php.net/manual/en/function.curl-setopt.php), to say the
+[interesting API](https://www.php.net/curl-setopt), to say the
 least, and you can't always rely on it being available. Sockets provide only low
 level access, and require you to build most of the HTTP response parsing
 yourself.
@@ -138,7 +138,7 @@ set of tests. We're not quite there yet, but [we're getting close][codecov].
 [codecov]: http://codecov.io/github/WordPress/Requests
 
 To run the test suite, first check that you have the [PHP
-JSON extension ](http://php.net/manual/en/book.json.php) enabled. Then
+JSON extension ](https://www.php.net/book.json) enabled. Then
 simply:
 ```bash
 $ phpunit

docs/hooks.md

@@ -49,7 +49,7 @@ Available Hooks
 
     Parameters: `string &$response, array &$info`
 
-    `$info` contains the associated array as defined in the return value for [curl_getinfo()](http://php.net/manual/en/function.curl-getinfo.php#refsect1-function.curl-getinfo-returnvalues).
+    `$info` contains the associated array as defined in the return value for [curl_getinfo()](https://www.php.net/curl-getinfo#refsect1-function.curl-getinfo-returnvalues).
 
 * **`fsockopen.before_request`**
 
@@ -77,7 +77,7 @@ Available Hooks
 
     Parameters: `string &$response, array &$info`
 
-    `$info` contains the associated array as defined in the return value for [stream_get_meta_data()](http://php.net/manual/en/function.stream-get-meta-data.php#refsect1-function.stream-get-meta-data-returnvalues).
+    `$info` contains the associated array as defined in the return value for [stream_get_meta_data()](https://www.php.net/stream-get-meta-data#refsect1-function.stream-get-meta-data-returnvalues).
 
 
 

docs/usage-advanced.md

@@ -67,8 +67,8 @@ See also the [related PHP][php-bug-47030] and [OpenSSL-related][php-bug-55820]
 bugs in PHP for more information on Subject Alternate Name field.
 
 [Mozilla certificate authority list]: http://www.mozilla.org/projects/security/certs/
-[php-bug-47030]: https://bugs.php.net/bug.php?id=47030
-[php-bug-55820]:https://bugs.php.net/bug.php?id=55820
+[php-bug-47030]: https://php.net/47030
+[php-bug-55820]: https://php.net/55820
 
 ***
 

docs/usage.md

@@ -54,7 +54,7 @@ You'll probably also want to pass in some data. You can pass in either a
 string, an array or an object (Requests uses [`http_build_query`][build_query]
 internally) as the third parameter (after the URL and headers):
 
-[build_query]: http://php.net/http_build_query
+[build_query]: https://www.php.net/http_build_query
 
 ```php
 $data = array('key1' => 'value1', 'key2' => 'value2');

library/Requests.php

@@ -872,8 +872,8 @@ public static function decompress($data) {
 	 *
 	 * @since 2.8.1
 	 * @link https://core.trac.wordpress.org/ticket/18273
-	 * @link https://secure.php.net/manual/en/function.gzinflate.php#70875
-	 * @link https://secure.php.net/manual/en/function.gzinflate.php#77336
+	 * @link https://www.php.net/gzinflate#70875
+	 * @link https://www.php.net/gzinflate#77336
 	 *
 	 * @param string $gz_data String to decompress.
 	 * @return string|bool False on failure.

library/Requests/Transport/cURL.php

@@ -33,7 +33,7 @@ class Requests_Transport_cURL implements Requests_Transport {
 	/**
 	 * Information on the current request
 	 *
-	 * @var array cURL information array, see {@see https://secure.php.net/curl_getinfo}
+	 * @var array cURL information array, see {@see https://www.php.net/curl_getinfo}
 	 */
 	public $info;
 
@@ -513,7 +513,7 @@ public function stream_body($handle, $data) {
 	 * Format a URL given GET data
 	 *
 	 * @param string $url
-	 * @param array|object $data Data to build query using, see {@see https://secure.php.net/http_build_query}
+	 * @param array|object $data Data to build query using, see {@see https://www.php.net/http_build_query}
 	 * @return string URL with data
 	 */
 	protected static function format_get($url, $data) {

library/Requests/Transport/fsockopen.php

@@ -30,7 +30,7 @@ class Requests_Transport_fsockopen implements Requests_Transport {
 	/**
 	 * Stream metadata
 	 *
-	 * @var array Associative array of properties, see {@see https://secure.php.net/stream_get_meta_data}
+	 * @var array Associative array of properties, see {@see https://www.php.net/stream_get_meta_data}
 	 */
 	public $info;
 
@@ -351,7 +351,7 @@ protected static function accept_encoding() {
 	 * Format a URL given GET data
 	 *
 	 * @param array $url_parts
-	 * @param array|object $data Data to build query using, see {@see https://secure.php.net/http_build_query}
+	 * @param array|object $data Data to build query using, see {@see https://www.php.net/http_build_query}
 	 * @return string URL with data
 	 */
 	protected static function format_get($url_parts, $data) {