php操作url 函数等

• pathinfo() - Returns information about a file path
• parse_str() - Parses the string into variables
• parse_url() - Parse a URL and return its components
• http_build_query() - Generate URL-encoded query string
• http_build_url() - Build a URL
• dirname() - Returns a parent directory's path
• basename() - Returns trailing name component of path

<?php

// 获取文件名称
echo basename("/data/www/test/filesystem.php"),"\n";
// 获取目录名称
echo dirname("/data/www/test/filesystem.php"),"\n";
echo __DIR__,"\n";

// 操作一个url，获取相关信息（注意php函数的使用

// parse_url处理url足够了。。第二个可选参数是php常量，直接获取数组中的某个value
$url_info = parse_url('http://www.google.com/abc/xyz/fck.php?id=1#sharp');
var_dump($url_info);
$result = pathinfo($url_info['path']);// pathinfo()可以info出一些文件名、目录名、后缀名等信息
var_dump($result);

/**
array(5) {
["scheme"]=>
string(4) "http"
["host"]=>
string(14) "www.google.com"
["path"]=>
string(16) "/abc/xyz/fck.php"
["query"]=>
string(4) "id=1"
["fragment"]=>
string(5) "sharp"
}

array(4) {
["dirname"]=>
string(8) "/abc/xyz"
["basename"]=>
string(7) "fck.php"
["extension"]=>
string(3) "php"
["filename"]=>
string(3) "fck"
}

**/

php中全局变量$_SERVER的一个例子：http://www.test.com/a/b/one.php?a=12#shart

Array
	(
	[USER] => nginx
	[HOME] => /var/cache/nginx
	[FCGI_ROLE] => RESPONDER
	[QUERY_STRING] => a=12
	[REQUEST_METHOD] => GET
	[CONTENT_TYPE] =>
	[CONTENT_LENGTH] =>
	[SCRIPT_NAME] => /a/b/one.php
	[REQUEST_URI] => /a/b/one.php?a=12
	[DOCUMENT_URI] => /a/b/one.php
	[DOCUMENT_ROOT] => /data/www/test
	[SERVER_PROTOCOL] => HTTP/1.1
	[GATEWAY_INTERFACE] => CGI/1.1
	[SERVER_SOFTWARE] => nginx/1.6.2
	[REMOTE_ADDR] => 192.168.80.190
	[REMOTE_PORT] => 54281
	[SERVER_ADDR] => 192.168.0.99
	[SERVER_PORT] => 80
	[SERVER_NAME] => www.test.com
	[REDIRECT_STATUS] => 200
	[SCRIPT_FILENAME] => /data/www/test/a/b/one.php
	[HTTP_HOST] => www.test.com
	[HTTP_CONNECTION] => keep-alive
	[HTTP_CACHE_CONTROL] => max-age=0
	[HTTP_ACCEPT] => text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
	[HTTP_UPGRADE_INSECURE_REQUESTS] => 1
	[HTTP_USER_AGENT] => Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36
	[HTTP_ACCEPT_ENCODING] => gzip, deflate, sdch
	[HTTP_ACCEPT_LANGUAGE] => zh-CN,zh;q=0.8
	[PHP_SELF] => /a/b/one.php
	[REQUEST_TIME] => 1456887300
	)