Detailed explanation of $_SERVER in PHP-PHP Tutorial-php.cn

I believe many students have seen $_SERVER in the process of PHP development. I believe many students are wondering what $_SERVER is. In fact, it is an array, and $_SERVER contains many things. So in this article, we will talk in detail about what is contained in the $_SERVER array in PHP

$_SERVER[&#39;HTTP_ACCEPT_LANGUAGE&#39;];//浏览器语言 
$_SERVER[&#39;REMOTE_ADDR&#39;]; //当前用户 IP 。 
$_SERVER[&#39;REMOTE_HOST&#39;]; //当前用户主机名 
$_SERVER[&#39;REQUEST_URI&#39;]; //URL
$_SERVER[&#39;REMOTE_PORT&#39;]; //端口。 
$_SERVER[&#39;SERVER_NAME&#39;]; //服务器主机的名称。 
$_SERVER[&#39;PHP_SELF&#39;];//正在执行脚本的文件名 
$_SERVER[&#39;argv&#39;]; //传递给该脚本的参数。 
$_SERVER[&#39;argc&#39;]; //传递给程序的命令行参数的个数。 
$_SERVER[&#39;GATEWAY_INTERFACE&#39;];//CGI 规范的版本。 
$_SERVER[&#39;SERVER_SOFTWARE&#39;]; //服务器标识的字串 
$_SERVER[&#39;SERVER_PROTOCOL&#39;]; //请求页面时通信协议的名称和版本 
$_SERVER[&#39;REQUEST_METHOD&#39;];//访问页面时的请求方法

$_SERVER[&#39;QUERY_STRING&#39;]; //查询(query)的字符串。
$_SERVER[&#39;DOCUMENT_ROOT&#39;]; //当前运行脚本所在的文档根目录 
$_SERVER[&#39;HTTP_ACCEPT&#39;]; //当前请求的 Accept: 头部的内容。 
$_SERVER[&#39;HTTP_ACCEPT_CHARSET&#39;]; //当前请求的 Accept-Charset: 头部的内容。 
$_SERVER[&#39;HTTP_ACCEPT_ENCODING&#39;]; //当前请求的 Accept-Encoding: 头部的内容 
$_SERVER[&#39;HTTP_CONNECTION&#39;]; //当前请求的 Connection: 头部的内容。例如：“Keep-Alive”。 
$_SERVER[&#39;HTTP_HOST&#39;]; //当前请求的 Host: 头部的内容。 
$_SERVER[&#39;HTTP_REFERER&#39;]; //链接到当前页面的前一页面的 URL 地址。 
$_SERVER[&#39;HTTP_USER_AGENT&#39;]; //当前请求的 User_Agent: 头部的内容。 
$_SERVER[&#39;HTTPS&#39;]; //如果通过https访问,则被设为一个非空的值(on)，否则返回off 
$_SERVER[&#39;SCRIPT_FILENAME&#39;]; //当前执行脚本的绝对路径名。 
$_SERVER[&#39;SERVER_ADMIN&#39;]; //管理员信息 
$_SERVER[&#39;SERVER_PORT&#39;]; //服务器所使用的端口 
$_SERVER[&#39;SERVER_SIGNATURE&#39;]; //包含服务器版本和虚拟主机名的字符串。 
$_SERVER[&#39;PATH_TRANSLATED&#39;]; //当前脚本所在文件系统（不是文档根目录）的基本路径。 
$_SERVER[&#39;SCRIPT_NAME&#39;]; //包含当前脚本的路径。这在页面需要指向自己时非常有用。 
$_SERVER[&#39;PHP_AUTH_USER&#39;]; //当 PHP 运行在 Apache 模块方式下，并且正在使用 HTTP 认证功能，这个变量便是用户输入的用户名。 
$_SERVER[&#39;PHP_AUTH_PW&#39;]; //当 PHP 运行在 Apache 模块方式下，并且正在使用 HTTP 认证功能，这个变量便是用户输入的密码。 
$_SERVER[&#39;AUTH_TYPE&#39;]; //当 PHP 运行在 Apache 模块方式下，并且正在使用 HTTP 认证功能，这个变量便是认证的类型

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The above are all the values in $_SERVER. We can treat $_SERVER as an ordinary Just like an array, you can modify it and other operations.

Two PHP methods to obtain the server IP address

PHP method to obtain the server IP address:

if (&#39;/&#39; == DIRECTORY_SEPARATOR) {
    $server_ip = $_SERVER[&#39;SERVER_ADDR&#39;];
} else {
    $server_ip = @gethostbyname($_SERVER[&#39;SERVER_NAME&#39;]);
}
echo $server_ip;

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php method two to get the server IP address:

/**
 * 获取服务器端IP地址
 * @return string
 */

function get_server_ip()
{
    if (isset($_SERVER)) {
        if ($_SERVER[&#39;SERVER_ADDR&#39;]) {
            $server_ip = $_SERVER[&#39;SERVER_ADDR&#39;];
        } else {
            $server_ip = $_SERVER[&#39;LOCAL_ADDR&#39;];
        }
    } else {
        $server_ip = getenv(&#39;SERVER_ADDR&#39;);
    }
    return $server_ip;
}

echo get_server_ip();

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$_SERVER in PHP is not complicated. If you look carefully, there are just a few things. The $_SERVER array in PHP contains server and execution environment information. array.

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$_SERVER in PHP Usage

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