How do I get the function name inside a function in PHP?

The accurate way is to use the __FUNCTION__ predefined magic constant.

Example:

class Test {
    function MethodA(){
        echo __FUNCTION__;
    }
}

Result: MethodA.

You can use the magic constants __METHOD__ (includes the class name) or __FUNCTION__ (just function name) depending on if it's a method or a function... =)