The keys represent the header name as it will be sent over the wire, and
each value is an array of strings associated with the header.
Represent the headers as a string
foreach ($message->getHeaders() as $name => $values) {
echo $name . ": " . implode(", ", $values);
}
public getHeaders ( ) : array | ||
return | array | returns an associative array of the message's headers. |