<?php
    if(isset($_GET['error']) == "weightError") {
        echo "Nurodytas klaidingas svoris.";
    } else if(isset($_GET['error']) == "heightError") {
        echo "Nurodytas klaidingas ūgis.";
    }
?>


<form action="calculate.php" method="POST">
    <label for="personWeight">Svoris</label>
    <input type="text" name="personWeight">

    <label for="password">Ūgis</label>
    <input type="text" name="personHeight">

    <button type="submit" name="submitForm">Toliau</button>
</form>