Use more "First class callable syntax" + Normalize set_error_handler/set_exception_handler calls

Author: lyrixx

Server/Connection.php

@@ -62,7 +62,7 @@ public function write(Data $data): bool
         $context = array_filter($context);
         $encodedPayload = base64_encode(serialize([$data, $context]))."\n";
 
-        set_error_handler(fn () => true);
+        set_error_handler(static fn () => null);
         try {
             if (-1 !== stream_socket_sendto($this->socket, $encodedPayload)) {
                 return true;
@@ -87,7 +87,7 @@ public function write(Data $data): bool
      */
     private function createSocket()
     {
-        set_error_handler(fn () => true);
+        set_error_handler(static fn () => null);
         try {
             return stream_socket_client($this->host, $errno, $errstr, 3) ?: null;
         } finally {