phpの$_を利用SERVERサーバ情報の表示

次のコードをphpファイルに書き込み、サーバに挿入します.

$val)
	{
		echo "$key=$val
";
	}
?>

ブラウザからアクセスすると、次のサーバの詳細が表示されます.
HTTP_HOST=localhost
HTTP_CONNECTION=keep-aliveHTTP_ACCEPT=text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8HTTP_USER_AGENT=Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36HTTP_ACCEPT_ENCODING=gzip,deflate,sdchHTTP_ACCEPT_LANGUAGE=zh-CN,zh;q=0.8,en;q=0.6PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x86;C:\Program Files (x86)\Intel\OpenCL SDK\2.0\bin\x64;D:\Program Files;C:\Program Files\Microsoft SQL Server\110\Tools\Binn\;C:\Program Files\Microsoft\Web Platform Installer\;C:\Program Files (x86)\Microsoft ASP.NET\ASP.NET Web Pages\v1.0\;C:\Program Files (x86)\Windows Kits\8.1\Windows Performance Toolkit\;C:\Program Files (x86)\IVI Foundation\VISA\WinNT\Bin\;C:\Program Files\IVI Foundation\VISA\Win64\Bin\;c:\Program Files (x86)\IVI Foundation\IVI\bin;c:\Program Files\IVI Foundation\IVI\bin;C:\Program Files (x86)\Microsoft SQL Server\90\Tools\binn\;D:\Program Files\matlabR2013a\runtime\win64;D:\Program Files\matlabR2013a\bin;SystemRoot=C:\WINDOWSCOMSPEC=C:\WINDOWS\system32\cmd.exePATHEXT=.COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSCWINDIR=C:\WINDOWSSERVER_SIGNATURE=
Apache/2.2.8 (Win32) PHP/5.2.6 Server at localhost Port 80
SERVER_SOFTWARE=Apache/2.2.8 (Win32) PHP/5.2.6
SERVER_NAME=localhost
SERVER_ADDR=127.0.0.1
SERVER_PORT=80
REMOTE_ADDR=127.0.0.1
DOCUMENT_ROOT=E:/myphp/AppServ/www
[email protected]
SCRIPT_FILENAME=E:/myphp/AppServ/www/http.php
REMOTE_PORT=15683
GATEWAY_INTERFACE=CGI/1.1
SERVER_PROTOCOL=HTTP/1.1
REQUEST_METHOD=GET
QUERY_STRING=
REQUEST_URI=/http.php
SCRIPT_NAME=/http.php
PHP_SELF=/http.php
REQUEST_TIME=1408434915
argv=Array
argc=0