PHP 5 >= 5.4.0, PHP 7, PHP 8
http_response_code - Get or Set the HTTP response code
http_response_code( [int$response_code = 0] ): int|bool
Gets or sets the HTTP response status code.
The optional response_code will set the response code.
If response_code is provided, then the previous status code will be returned. If response_code is not provided, then the current status code will be returned. Both of these values will default to a 200 status code if used in a web server environment.
false will be returned if response_code is not provided and it is not invoked in a web server environment (such as from a CLI application). true will be returned if response_code is provided and it is not invoked in a web server environment (but only when no previous response status has been set).
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