<?php

    function harmonicMeanV1()
    {
    	$result = 0;
    	$arguments = func_get_args();
    
    	foreach ($arguments as $argument)
    	{
    		$result += 1 / $argument;
    	}

var_dump('Sum is = ' . $result);
    	
    	return func_num_args() / $result;
    }

var_dump(harmonicMeanV1(-2, 3, 6));

string(29) "Sum is = -2.7755575615629E-17"
float(-108086391056890000)