Give me your best answer
 

What is difference between ruby on rails and PHP and which one is better for my website?

The talk is not what is best of your site, the thing is what environment you prefer to Develop your website : Ruby ir Rails !

PHP Function

function say_hello($name) {
$out = "Hello $name";
return $out;
}
Ruby Function

def say_hello(name)
out = "Hello ${name}"
return out
end