public static function getHeaderInfo($header = '', $echo = true)
{
ob_start();
$headers = getallheaders();
if (!empty($header)) {
$info = $headers[$header];
echo $header . ':' . $info . "\n";
} else {
foreach ($headers as $key => $val) {
echo "{$key}:{$val}\n";
}
}
$output = ob_get_clean();
if ($echo) {
echo nl2br($output);
} else {
return $output;
}
return '';
}