Random array element

Returns a random element of a given array.

function random_array_element(&$a){

    mt_srand((double)microtime()*1000000); 

    // get all array keys:
    $k = array_keys($a);

    // find a random array key:
    $r = mt_rand(0, count($k)-1);
    $rk = $k[$r];

    // return the random key (if exists):
    return isset($a[$rk]) ? $a[$rk] : '';
}

// works with both array types:
$array = array(1,2,3);

// and also:
$array = array('one' => 1, 'two' => 2, 'three' => 3);

// example:
print random_array_element($array);