<form method="post" action="template-parts/submit.php" class="leadForm" id="leadForm">
<fieldset id="step-1">
        <!-- Lead Form Step 1 -->
        <h4 class="leadForm__title">Get an instant quote</br>
            or call now (800) 973-3333 </h4>
        <div class="input-container">
            <label for="zipFrom">Transport car FROM</label>
            <span id="zipFrom__error"></span>
            <input type="text" id="zipFrom" name="zipFrom" placeholder="ZIP or City">
        </div>
        <div class="input-container">
            <label for="zipTo">Transport car TO</label>
            <span id="zipTo__error"></span>
            <input type="text" id="zipTo" placeholder="ZIP or City">
        </div>
</form>

<?php
function handle_form_data()
{
    // Check if the form was submitted
    if ($_SERVER["REQUEST_METHOD"] == "POST") {
        // Collect form data
        $zipFrom = sanitize_text_field($_POST['zipFrom']);
        $zipTo = sanitize_email($_POST['zipTo']);
        // Process the data (for this example, just echoing it)
        if (!empty($zipFrom) && !empty($zipTo)) {
            echo "Submitted Name: " . $zipFrom . "<br>";
            echo "Submitted Email: " . $zipTo;
        } else {
            echo "Please fill in all the fields!";
        }
    }
    // You might want to redirect the user after processing the form
    wp_redirect(home_url()); // Redirect to homepage
    exit;
}
?>

<form action="template-parts/submit.php "></form>