Calculate median and average in PHP.php

function median($arr){
    if($arr){
        $count = count($arr);
        sort($arr);
        $mid = floor($count/2);
        return ($arr[$mid]+$arr[$mid+1-$count%2])/2;
    }
    return false;
}
function average($arr){
    return ($arr) ? array_sum($arr)/count($arr) : false;
}

//test it out
$test = array(
    array(5,2,1,3,4),
    array(),
    array(1)
);
foreach($test as $arr){
    echo 'avg: '.average($arr)."<br>";
    echo 'median: '.median($arr)."<br>";
}