PHP Superglobals are always accessible regardless of their scope, i.e., we can access them from any function, class or a file without even declaring them. Superglobals are available in all scopes throughout a script. There is no need to do global $variable; to access then within functions or methods. The PHP Superglobals represent data coming from URLs, HTML forms, cookies, sessions, and the Web server itself.
Following are the Superglobals in PHP:
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$_GET – is used to collect the data from the form while submitting an HTML from with get method. It is also used to collect data which is sent in the url.
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$_POST - is used to collect the data from the form while submitting an HTML from with post method. It is also used to pass variables.
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$_REQUEST – is used to collect data after submitting an HTML form. The variables in $_REQUEST are provided to the script via the GET, POST, and COOKIE input mechanisms.
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$_SERVER – is an array containing information such as headers, paths, and script locations. Entries in this array are created by the web server
List of important elements that can go inside $_SERVER:
| Element/Code |
Description |
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$_SERVER['PHP_SELF']
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Returns the filename of the currently executing script
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$_SERVER['SERVER_PORT']
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Returns the port on the server machine being used by the web server for communication (such as 80)
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$_SERVER['HTTP_HOST']
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Returns the Host header from the current request
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$_SERVER['HTTPS']
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Is the script queried through a secure HTTP protocol
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$_SERVER['REMOTE_ADDR']
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Returns the IP address from where the user is viewing the current page
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$_SERVER['REMOTE_HOST']
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Returns the Host name from where the user is viewing the current page
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$_SERVER['GATEWAY_INTERFACE']
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Returns the version of the Common Gateway Interface (CGI) the server is using
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$_SERVER['SERVER_ADDR']
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Returns the IP address of the host server
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$_SERVER['SERVER_NAME']
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Returns the name of the host server
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$_SERVER['SERVER_PROTOCOL']
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Returns the name and revision of the information protocol (such as HTTP/1.1)
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$_SERVER['REQUEST_METHOD']
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Returns the request method used to access the page (such as POST)
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$_SERVER['REQUEST_TIME']
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Returns the timestamp of the start of the request
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$_SERVER['HTTP_ACCE]
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Returns the Accept header from the current request
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