Using functions from within the same class

You can try a static call like this:

function doAnother ($str) {
    return self::doSomething($str);
}

Or if you want to make it a dynamic call, you can use $this keyword, thus calling a function of a class instance:

function doAnother ($str) {
    return $this->doSomething($str);
}

Try:

return $this->doSomething($str);

Have a look at this as well: http://php.net/manual/en/language.oop5.php

Try the following:

return $this->doSomething($str);

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