Add Record/Level/LevelName type aliases and improve phpstan type coverage to level 6

src/Monolog/Handler/SyslogUdpHandler.php

@@ -27,14 +27,18 @@ class SyslogUdpHandler extends AbstractSyslogHandler
     const RFC5424 = 1;
     const RFC5424e = 2;
 
+    /** @var array<self::RFC*, string> */
     private $dateFormats = array(
         self::RFC3164 => 'M d H:i:s',
         self::RFC5424 => \DateTime::RFC3339,
         self::RFC5424e => \DateTime::RFC3339_EXTENDED,
     );
 
+    /** @var UdpSocket */
     protected $socket;
+    /** @var string */
     protected $ident;
+    /** @var self::RFC* */
     protected $rfc;
 
     /**
@@ -45,6 +49,8 @@ class SyslogUdpHandler extends AbstractSyslogHandler
      * @param bool       $bubble   Whether the messages that are handled can bubble up the stack or not
      * @param string     $ident    Program name or tag for each log message.
      * @param int        $rfc      RFC to format the message for.
+     *
+     * @phpstan-param self::RFC* $rfc
      */
     public function __construct(string $host, int $port = 514, $facility = LOG_USER, $level = Logger::DEBUG, bool $bubble = true, string $ident = 'php', int $rfc = self::RFC5424)
     {
@@ -72,6 +78,10 @@ class SyslogUdpHandler extends AbstractSyslogHandler
         $this->socket->close();
     }
 
+    /**
+     * @param string|string[] $message
+     * @return string[]
+     */
     private function splitMessageIntoLines($message): array
     {
         if (is_array($message)) {