Analysis of $_SERVER function in php

I don’t know how much you understand the $_SERVER function now. This article mainly shares with you the analysis of the $_SERVER function in PHP. I hope it can help you.

$_SERVER['HTTP_ACCEPT_LANGUAGE']//Browser language

$_SERVER['REMOTE_ADDR'] //Current user IP.

$_SERVER['REMOTE_HOST'] //Current user host name

$_SERVER['REQUEST_URI'] //URL

$_SERVER['REMOTE_PORT'] //Port.

$_SERVER['SERVER_NAME'] //The name of the server host.

$_SERVER['PHP_SELF']//The file name of the executing script

$_SERVER['argv'] //The parameters passed to the script.

$_SERVER['argc'] //The number of command line parameters passed to the program.

$_SERVER['GATEWAY_INTERFACE']//CGI specification version.

$_SERVER['SERVER_SOFTWARE'] //The string of server identification

$_SERVER['SERVER_PROTOCOL'] //The name and version of the communication protocol when requesting the page

$_SERVER['REQUEST_METHOD']//Request method when accessing the page

$_SERVER['QUERY_STRING'] //Query string.

$_SERVER['DOCUMENT_ROOT'] //The document root directory where the currently running script is located

$_SERVER['HTTP_ACCEPT'] //The content of the Accept: header of the current request.

$_SERVER['HTTP_ACCEPT_CHARSET'] //The content of the Accept-Charset: header of the current request.

$_SERVER['HTTP_ACCEPT_ENCODING'] //The current request's Accept-Encoding: the content of the header

$_SERVER['HTTP_CONNECTION'] //The current request's Connection: the content of the header . For example: "Keep-Alive".

$_SERVER['HTTP_HOST'] //The content of the Host: header of the current request.

$_SERVER['HTTP_REFERER'] //The URL address of the previous page linked to the current page.

$_SERVER['HTTP_USER_AGENT'] //Contents of the User_Agent: header of the current request.

$_SERVER['HTTPS']//If accessed through https, it is set to a non-empty value (on), otherwise it returns off

$_SERVER['SCRIPT_FILENAME'] # The absolute pathname of the currently executing script.

$_SERVER['SERVER_ADMIN'] #Administrator information

$_SERVER['SERVER_PORT'] #Port used by the server

$_SERVER['SERVER_SIGNATURE'] # A string containing the server version and virtual hostname.

$_SERVER['PATH_TRANSLATED'] #The base path of the file system (not the document root directory) where the current script is located.

$_SERVER['SCRIPT_NAME'] #Contains the path of the current script. This is useful when the page needs to point to itself.

$_SERVER['PHP_AUTH_USER'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the username entered by the user.

$_SERVER['PHP_AUTH_PW'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.

$_SERVER['AUTH_TYPE'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the authentication type

php method to get server ip (1)

if('/'==DIRECTORY_SEPARATOR){
    $server_ip=$_SERVER['SERVER_ADDR'];
}else{
    $server_ip=@gethostbyname($_SERVER['SERVER_NAME']);
}
echo $server_ip;

php method to get server ip (2 )

function get_server_ip(){
    if(isset($_SERVER)){
        if($_SERVER['SERVER_ADDR']){
            $server_ip=$_SERVER['SERVER_ADDR'];
        }else{
            $server_ip=$_SERVER['LOCAL_ADDR'];
        }
    }else{
        $server_ip = getenv('SERVER_ADDR');
    }
    return $server_ip;
}
 
echo get_server_ip();

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