Generate Table with rand Values

<?php
// Create a random Array for test
$a = array();
for($i=0;$i<20;$i++){
    $a[$i] = $i."val";
}

// Get Multidimensional array from data
function getMDA($data,$width,$height){
    $na = array();
    for($h=0;$h<$height;$h++){
        for($w=0;$w<$width;$w++){
            $randkey = mt_rand(0, count($data) - 1);
            $ma[$h][$w] = $data[$randkey];
            array_splice($data, $randkey, 1);
            //unset($data[$randkey]);
        }
    }
    return $ma;
}

// Create Table from multidiomensional array "data"
// can get dimensions because its multidimensional
function createtable($data){

}

var_dump(getMDA($a,2,2));