Average calculator

<?php

function average($numbers=array())
{
 if (!is_array($numbers))
  $numbers = func_get_args();
 
 $sum = 0;
 $amt = count($numbers);
 
 foreach($numbers as $num)
  $sum += $num;
   
 return ($amt > 0) ? ($sum / $amt) : false; // no division by zero
}



echo average(array(3,4,5)); // 4
echo average(50,30,40); // 40

?>

Usage

As seen in the commented portion of code, this function can take either an array of numbers, or multiple parameters of numbers.