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Undefined Variable With Form Validation

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In the following code I am validating a url in a practice page I am using from the stuff I learned in the book­. When I enter an invalid url in my form, I get an $url undefined error when running the code below. I am guessing the error is pretty easy to spot, but I am new at this. 


if (filter_var($scrubbed['url'], FILTER_VALIDATE_URL)){

$url = mysqli_real_escape_string($dbc, $scrubbed['url']);

} else {

echo '<p class="error">Please enter a valid url</p>';


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