What are the potential issues with using client-side JavaScript for form validation while relying on PHP for server-side validation?

Potential issue: Relying solely on client-side JavaScript for form validation can lead to security vulnerabilities as it can be easily bypassed by users. To mitigate this risk, it is essential to perform server-side validation using PHP to ensure the data received is valid and secure. PHP code snippet for server-side validation: 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = $_POST["name"];
    $email = $_POST["email"];
    
    if (empty($name) || empty($email)) {
        echo "Please fill out all required fields.";
    } else {
        // Perform additional server-side validation here
        // For example, validating email format or checking against a database
        
        // If all validation passes, process the form data
        echo "Form submitted successfully!";
    }
}
?>

Keywords

client-side JavaScript form validation PHP server-side validation potential issues

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