Check for valid (not dead) links using PHP

function is_available($url, $timeout = 30) {
 $ch = curl_init(); // get cURL handle
 $opts = array(
 CURLOPT_RETURNTRANSFER => true, 
 CURLOPT_URL => $url,
 CURLOPT_NOBODY => true
 CURLOPT_TIMEOUT => $timeout
 );
 curl_setopt_array($ch, $opts); 
 curl_exec($ch); 
 $retval = curl_getinfo($ch, CURLINFO_HTTP_CODE) == 200;
 curl_close($ch); 
 return $retval;
}

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