What potential pitfalls should be considered when implementing a button click requirement in PHP?

One potential pitfall when implementing a button click requirement in PHP is relying solely on client-side validation, which can be bypassed by users with knowledge of web development tools. To address this, it is important to also perform server-side validation to ensure the button click requirement is enforced. This can be done by checking if the button was clicked before processing the form submission. 

if(isset($_POST['submit_button'])) {
    // Process form submission
} else {
    // Redirect or display an error message
}

Keywords

event handling form submission server-side validation error handling security vulnerabilities

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