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➲ HTTP Status Code:

HTTP status codes are used to communicate the status of a web server response for the user request to the browser.

☴ Overview:

  1. 1xx Information
  2. 2xx Success
  3. 3xx Redirection
  4. 4xx Client Error
  5. 5xx Server Error
  6. Usage

✦ 1xx Information:

This series of status code used for information purpose. - 100 Continue: The client should continue with the request. - 101 Switching Protocols: The server is switching protocols.

✦ 2xx Success:

This series of status code used for successful status for the request. - 200 OK: The request was successful. - 201 Created: The request was successful, and a new resource was created. - 202 Accepted: The request was accepted for processing, but the processing has not been completed. - 204 No Content: The request was successful, but there is no content.

✦ 3xx Redirection:

This series of status code used for redirection purpose. - 301 Moved Permanently: The resource has been permanently moved to a new location. - 302 Found: The resource has been temporarily moved to a new location. - 304 Not Modified: The resource has not been modified since the last request.

✦ 4xx Client Error:

This series of status code used for client side error. - 400 Bad Request: The request was invalid. - 401 Unauthorized: The request requires authentication. - 403 Forbidden: The server understood the request but refuses to fulfill it. - 404 Not Found: The requested resource could not be found. - 405 Method Not Allowed: The method specified in the request is not allowed for the resource. - 409 Conflict: The request could not be completed due to a conflict with the current state of the resource.

✦ 5xx Server Error:

This series of status code used for server errors. - 500 Internal Server Error: A generic error that indicates the server encountered an error. - 503 Service Unavailable: The server is currently unavailable.

✦ Usage:

To send HTTP status code using the http_response_code function with status code.

Example:

http_response_code(404);
echo "Page not found";

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