PHP: How to extract emails from list file

 
$pattern = '/[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,}/';
if ($file = fopen("a.vcf", "r")) {
    while(!feof($file)) {
        $line = fgets($file);
       if (preg_match($pattern, $line, $matches)) echo $matches[0]."\n";
    }
    fclose($file);
}