frequent tag

<!DOCTYPE html>
<html>
<head>
    <title>Most Frequent Tag</title>
</head>
<body>
<p>Enter Tags:</p>
<form action="02.%20MostFrequentTag.php" method="post">
    <input type="text" name="tags">
    <input type="submit" name="submit">
</form>
</body>
</html>

<?php
if (isset($_POST['submit'])) {
    $allTags = preg_split('/[\s,]+/', $_POST['tags']);
    $countValues = array_count_values($allTags);
    arsort($countValues);
    $valueChecker = 0;
    $getMaxValueName = "";
    foreach ($countValues as $key => $keyValue) {
        echo("$key : $keyValue times <br>");
        if($keyValue > $valueChecker) {
            $valueChecker = $keyValue;
            $getMaxValueName = $key;
        }
    }

    echo("<p>Most Frequent Tag is: $getMaxValueName</p>");
}
?>