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check website url is exist or not using php

TO check website url use following code:

 $domain = $request->input('url');
$file_headers = @get_headers($domain);
if(!$file_headers || $file_headers[0] == 'HTTP/1.1 404 Not Found') {
echo  'The url doesn’t seem to be valid!';
}
else{
          echo "Valid url";
}
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