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I want to create a condition for my script. It starts with reading an array, this array can be unlimited, at least 4 up to 40 elements. These elements contain 2 variables. I figured out foreach is a better solution than switch (which I use now) In the next example (simple version of my above purpose) I show what I indicate. <?php $elements = array('Volvo', 'Honda', 'Ford'); ?> <form method="post"> <select name="menudrop"> <?php foreach ($elements as $value) : ?> <option value="<?php echo $value ?>"><?php echo $value ?></option> <?php endforeach; ?> </select> <input type="submit" value="submit" /> </form> <?php if (in_array($_POST['menudrop'], $elements)){ echo 'Clients enjoy eating a ' . $_POST['menudrop']; } ?> The problem is an error. The line with the error is: if (in_array($_POST['menudrop'], $elements)) what exactly does this error mean? The script is running and all things are executed like I intended, but I still get an error message at the screen. Notice: Undefined index: