$_SERVER['REQUEST_METHOD'] vs. $_POST: Which Should You Use to Check for a POST Request?

Checking Request Method vs. Checking $_POST Array in PHP

A recent discussion arose over the validity of using $_SERVER['REQUEST_METHOD'] == 'POST' versus if ($_POST) to determine the request type. The former checks the request method, while the latter checks for the existence of any POST data.

Operational Differences

Contrary to popular belief, these two conditions do not perform the same function. $_SERVER['REQUEST_METHOD'] solely verifies the request method, while $_POST checks for the presence of POST data.

Advantages and Disadvantages

• Checking Request Method (if ($_SERVER['REQUEST_METHOD'] == 'POST')): Ensures that the request is genuinely a POST request, even if no POST data is present. This approach is more versatile as it allows for differentiation between POST and non-POST requests.
• Checking POST Array (if ($_POST)): Only verifies the existence of any POST data, regardless of the request method. This approach is simpler and more concise but may not be appropriate in situations where distinguishing between request methods is crucial.

Real-World Application

The choice between these two approaches depends on specific requirements. If determining the request method is paramount, then checking $_SERVER['REQUEST_METHOD'] is recommended. Conversely, if simply verifying the presence of POST data suffices, checking $_POST is a viable option. Additionally, checking both conditions can provide comprehensive form validation by ensuring both the request method and required POST data are present.

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