Why is my 'shutdown callback ' invalid when using register_shutdown_function()?

Question

Warning: register_shutdown_function(): Invalid shutdown callback

trait ErrorTrait {

        public function shutDownFunction() { 
            $error = erro         


        

Answer 1

You are passing a string instead of a callable into register_shutdown_function. The call should look like

register_shutdown_function([$this, 'shutDownFunction']);