What are common mistakes in the provided PHP code that could cause the contact form not to work?

One common mistake that could cause the contact form not to work is not properly setting the "action" attribute in the HTML form to point to the PHP script handling the form submission. Additionally, not using the correct method (POST or GET) in the form tag can also cause issues. Another common mistake is not properly sanitizing and validating user input in the PHP script, leading to potential security vulnerabilities. 

<?php
// Ensure the form action points to the correct PHP script
<form action="process_form.php" method="post">
    <input type="text" name="name" placeholder="Name">
    <input type="email" name="email" placeholder="Email">
    <textarea name="message" placeholder="Message"></textarea>
    <button type="submit">Submit</button>
</form>

// Properly sanitize and validate user input in the PHP script
<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    $name = htmlspecialchars($_POST["name"]);
    $email = filter_var($_POST["email"], FILTER_VALIDATE_EMAIL);
    $message = htmlspecialchars($_POST["message"]);

    // Process form submission
}
?>

Keywords

syntax error missing semicolon incorrect variable name wrong function call server configuration

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