URL & Email Parsing

<?php

$url1 = '//google.com';
$url2 = 'http://google.com';
$url3 = 'https://google.com';
$url4 = 'google.com';
$email = '[email protected]';

echo "Value: {$url1} Result:"; var_dump( parse_url( $url1 ) );

echo "Value: {$url2}  Result:"; var_dump( parse_url( $url2 ) );

echo "Value: {$url3}  Result:"; var_dump( parse_url( $url3 ) );

echo "Value: {$url4}  Result:"; var_dump( parse_url( $url4 ) );

echo "Value: {$email}  Result:"; var_dump( parse_url( $email ) );