preload php error class

Author: matthi4s

src/Runtime/SocketRuntime.php

@@ -38,6 +38,10 @@ public function __construct(?SocketInterface $socket = null)
         }
         set_error_handler($this->handleError(...), E_ALL);
         $this->setReady();
+
+        // Force loading of PhpError class, because it might not be possible to load the class in the
+        // error handler, e.g. when the open files limit is reached
+        class_exists(PhpError::class);
     }
 
     /**