Saved from https://stackoverflow.com/questions/7791126/how-to-create-a-simple-php-cookie-language-toggle

index.php

<form action="language_switcher.php" method="post">
    <select name="lang">
        <option value="en"<?php if( $_COOKIE["language"] == "en" ) { echo " selected"; } ?>>English</option>
        <option value="ru"<?php if( $_COOKIE["language"] == "ru" ) { echo " selected"; } ?>>Russian</option>
    </select>
    <input type="submit" value="Select Language">
</form>

<p>Language: <?php if( isset( $_COOKIE["language"] ) ) { echo $_COOKIE["language"]; } else { echo "<em>not set</em>"; } ?></p>