Coloring Texts

<!--Write a PHP program TextColorer.php that takes a text from a textfield, colors each character
according to its ASCII value and prints the result. If the ASCII value of a character is odd,
the character should be printed in blue. If it’s even, it should be printed in red.-->

<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>Coloring Texts</title>
    <style type="text/css">
        body > p {
            font-family: "Courier New", monospace;
            font-size: 18px;
            color: #F00;
        }

        span {
            color: #00F;
        }
    </style>
</head>
<body>
<form method="post">
    <textarea name="text" cols="50" rows="5" placeholder="Enter your text..."></textarea>

    <p><input type="submit" value="Color text"/></p>
</form>
<p>
    <?php
    mb_internal_encoding('UTF-8');
    if (!isset($_POST) || !isset($_POST['text']) || trim($_POST['text']) === '') {
        die("The Input Form can't been Empty!!!");
    }

    $textArr = str_split(trim($_POST['text']));
    foreach ($textArr as $char) {
        if (ord($char) % 2 !== 0) {
            echo '<span>' . $char . ' </span>';
        } else {
            echo $char . ' ';
        }
    }
    ?>
</p>
</body>
</html>