Remove Duplicate Lines

I created this because I needed it regularly, and thought I'd share. Click here to run it, and look below to make one for yourself:

if (isset($_POST['submit'])) {

$inputText = $_POST['inputText'];

$lines = explode("\n", $inputText); // Split the input into lines

$uniqueLines = array_unique($lines); // Remove duplicates

$resultText = implode("\n", $uniqueLines); // Join lines back together

echo "

echo "" . htmlspecialchars($resultText) . "";

}