gistfile1.txt

<?php
$a = array(array(10, 11, 2), array(15,19,7), array(1,30,20) );
$buffer = array();
$max = $a[0][0];
for($i = 0;$i < count($a);$i++){
    for ($j = 0; $j < count($a[$i]); $j++){
        if($a[$i][$j] > $max) {
           $max =  $a[$i][$j];
        }
    }
    $buffer[$i] = $max;
}
foreach ($buffer as $v){
    $v = $v + $v;
}
echo $v;
?>