What are the potential drawbacks of relying solely on client-side validation for data integrity in PHP applications?

Relying solely on client-side validation for data integrity in PHP applications can be risky as it can be easily bypassed by users who manipulate the client-side code. To ensure data integrity, it is essential to also perform server-side validation to validate and sanitize user input before processing it. 

// Server-side validation example
if(isset($_POST['email'])){
    $email = $_POST['email'];
    
    // Validate email format
    if(filter_var($email, FILTER_VALIDATE_EMAIL)){
        // Process the email
    } else {
        echo "Invalid email format";
    }
}

Keywords

client-side validation data integrity PHP applications security vulnerabilities server-side validation

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