The action PHP file was displaying 'success', but also raised a warning due to incorrectly placed brackets in the if statement checking the request method. The correct syntax should be 'if($_SERVER['REQUEST_METHOD'] === 'POST')'. This misplacement treats 'POST' as an array key rather than comparing the request method, leading to the 'Undefined array key' warning. Proper syntax is crucial to prevent such warnings and ensure that forms are processed as intended when submitted.
The correct syntax for checking the request method should be 'if($_SERVER['REQUEST_METHOD'] === 'POST')'. The placement of brackets was incorrect.
The warning 'Undefined array key 0' indicates a potential logic error where $_SERVER is not being accessed correctly, reinforcing the importance of correct syntax.
Ensure proper syntax in PHP to avoid common pitfalls. Check logical expressions and variable access to prevent runtime warnings and unexpected behavior.
When debugging PHP forms, double-check the conditions and request methods to ensure data is being processed correctly, avoiding warnings related to undefined keys.
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