Predefined Variables in PHP

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Predefined variables in PHP are variables that are automatically defined by the PHP interpreter. They provide information about the server environment, user input, and other runtime details.

One commonly used predefined variable is $_SERVER, which contains information about the server and execution environment, such as server name, host name, and script filename.

Another example is $_GET, which is an array containing variables passed to the current script via the URL parameters. It allows access to data submitted to the script through HTTP GET requests.