Pretty Text Hasher

<?php
$text = $_GET['text'];
$hashValue = (int)$_GET['hashValue'];
$fontSize = $_GET['fontSize'];
$fontStyle = $_GET['fontStyle'];

$result = "style=\"font-size:{$fontSize};";
if ($fontStyle == 'bold') {
    $result .= 'font-weight:bold;">';
} else {
    $result .= "font-style:{$fontStyle};\">";
}

function encryptInputText($text, $hashValue) {
    $encrypted = '';
    for ($i = 0; $i < strlen($text); $i++) {
        $asciiValue = ord($text[$i]);
        if (($i % 2) == 0) {
            $encrypted .= chr($asciiValue + $hashValue);
        } else {
            $encrypted .= chr($asciiValue - $hashValue);
        }
    }

    return $encrypted;
}

$result .= encryptInputText($text, $hashValue);

echo "<p {$result}</p>";