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Check that a URL or website address is valid using preg_match().
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<?php
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$url = 'http://www.evilwalrus.org';
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$urlValid = preg_match('|^http(s)?://[a-z0-9-]+(.[a-z0-9-]+)*(:[0-9]+)?(/.*)?$|i', $url);
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if($urlValid) {
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echo 'URL is valid!'; // this will display
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} else {
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echo 'Something is wrong with the URL';
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}
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?>
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