// init lua$lua = new Lua();/*** Hello world method*/function helloWorld(){ return "hello world";}// register our hello world method$lua->registerCallback("helloWorld", helloWorld);$lua->eval(" -- call php method local retVal = helloWorld() print(retVal)");// register our hello world method but using an other name$lua->registerCallback("worldHello", helloWorld);// run our lua script$lua->eval(" -- call php method local retVal = worldHello() print(retVal)");