What we are introducing to you today is a concrete way to get the function of the current URL of PHP, through the understanding of this function method, further deepen our understanding of the PHP language, improve our learning level.
Examples of PHP 5.0 constructors explain how PHP obtains the current URL in the following ways:
$url _this = "' http://'. $_server[' server_name '.". $_server["Server_port"].$_server["Request_uri"];;
echo $url _this;
The display is: http://localhost/drupaluser/index.php
Server variable: $_server
Note: Used in PHP 4.1.0 and later versions. Previous versions, using the $HTTP _server_vars.
$_server is an array that contains a header (headers), a path (paths), and a script location (scrīpt locations). The entity of the array is created by the Web server. There is no guarantee that all servers will generate all the information; the server may have ignored some information or generated some new information that is not listed below. This means that a large number of these variables are described in CGI 1.1 specification, so you should study it carefully.
This is a "superglobal", or can be described as an automatic global variable. This simply means that it works in all scripts. You do not need to use the global $_server in a function or method; Access it as if you were using a $HTTP _server_vars.
$HTTP _server_vars contains the same information, but not an automatic global variable. (Note: $HTTP _server_vars and $_server are different variables, and PHP handles them in different ways.) )
If the register_globals directive is set, these variables are also available in all scripts, that is, the $_server and $HTTP _server_vars arrays are separated. For related information, please refer to the section on security using Register Globals. These individual global variables are not automatic global variables.
You may find that some of the $_server elements listed below are not available. Note that if you run PHP as a command line, the elements listed below are almost no valid (or meaningless).
The file name of the currently executing script, which is related to document root. For example, using $_server[' php_self ' in a script with a URL address of Http://example.com/test.php/foo.bar will give the result/test.php/foo.bar.
If PHP is running as a command line, the variable is not valid.
The arguments passed to the script. When the script runs in command-line mode, the ARGV variable is passed to the program's C-language style command-line arguments. When the GET method is called, the variable contains the requested data.
Contains the number of command-line arguments passed to the program (if run in command-line mode).
The version of the CGI specification used by the server. For example, "cgi/1.1".
' Server_Name '
The name of the server host where the script is currently running. If the script is running on a virtual host, the name is determined by the value set by that virtual host.
' Server_software '
The string that the server identifies is given in the header in response to the request.
The name and version of the communication protocol when the page is requested. For example, "http/1.0".
The request method when the page is accessed. For example:, POST, PUT.
A string that queries (query).
The document root directory where the script is currently running. Defined in the server configuration file.
Accept for current request: The contents of the header.
Accept-charset of the current request: the contents of the header. For example: "Iso-8859-1,*,utf-8".
Accept-encoding of the current request: the contents of the header. For example: "gzip".
Accept-language of the current request: the contents of the header. For example: "en".
Connection of the current request: the contents of the header. For example: "Keep-alive".
Host of the current request: the contents of the header.
The URL address of the previous page that links to the current page. Not all user agents (browsers) will set this variable, and some can manually modify the Http_referer. Therefore, this variable is not always correct and true.
User_agent of the current request: the contents of the header. The string indicates the information of the user agent accessing the page. A typical example is: mozilla/4.5 [en] (X11; U Linux 2.2.9 i586). You can also use Get_browser () to get this information.
The IP address of the user who is browsing the current page.
' Remote_host '
The host name of the user who is browsing the current page. Reverse Domain name resolution is based on the user's remote_addr.
Note: The WEB server must be configured to establish this variable. For example, Apache needs to have hostnamelookups on in httpd.conf. See Gethostbyaddr ().
The port that the user uses when connecting to the server.
The absolute path name of the currently executing script.
This value indicates the Server_admin parameter in the Apache server configuration file. If the script is running on a virtual host, the value is the value of that virtual host.
The port used by the server. The default is "80". If you are using an SSL secure connection, this value is the HTTP port you set.
A string containing the server version and the virtual host name.
The base path to the file system (not the document root) where the current script resides. This is the result of the server making a virtual-to-real-path image.
Contains the path to the current script. This is useful when the page needs to point to itself.
The URI required to access this page. For example, "/index.html".
When PHP is running in the Apache module mode and is using the HTTP authentication feature, this variable is the user name entered by the user.
When PHP is running in the Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.
This variable is the type of authentication when PHP is running in the Apache module mode and is using the HTTP authentication feature.
The above is the PHP described in this article to get the current URL all methods, I hope to help you
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