Performance tools
                        Composer overload class
                         
                    
                Allow to overload autoloaded classes, to include your files instead of supposed ones.
steevanb/composer-overload-class
                        PHP backtrace
                         
                    
                Show nice equivalent to debug_backtrace(), with caller, code preview etc.
steevanb/php-backtrace
                        Composer autoload infos
                         
                    
                View Composer autoload informations: included files, autoloaded classes etc.
huttopia/composer-autoload-infos
                        Blackfire
                         
                    
                Profile & optimize PHP apps.
blackfire.io