is an array containing information such as headers, paths, and script locations.The entries in this array are created by the web server.
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This simply means that it is available in all scopes throughout a script.
There is no need to do global $variable; to access it within functions or methods.
/* That will give you the result of each variable like (if the file is server_at the root and Apache Web directory is in E:\web) : PHP_SELF /server_argv - argc - GATEWAY_INTERFACE CGI/1.1 SERVER_ADDR 127.0.0.1 SERVER_NAME localhost SERVER_SOFTWARE Apache/2.2.22 (Win64) PHP/5.3.13 SERVER_PROTOCOL HTTP/1.1 REQUEST_METHOD GET REQUEST_TIME 1361542579 REQUEST_TIME_FLOAT - QUERY_STRING DOCUMENT_ROOT E:/web/ HTTP_ACCEPT text/html,application/xhtml+xml,application/xml;q=0.9,*/ 1.
All elements of the $_SERVER array whose keys begin with 'HTTP_' come from HTTP request headers and are not to be trusted.2.
When called via the GET method, this will contain the query string.
in order to get the physical (real) port, otherwise, this value can be spoofed and it may or may not return the physical port value.
It is not safe to rely on this value in security-dependent contexts.
Note: This is a 'superglobal', or automatic global, variable.
All HTTP headers sent to the script are made available through the $_SERVER array, with names prefixed by 'HTTP_'.3. If login.php/nearly_arbitrary_string is requested, $_SERVER['PHP_SELF'] will contain not just login.php, but the entire login.php/nearly_arbitrary_string.