PHP array sum operation

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<?php
 
/*二维数组的加和计算
$arr=[
&#39;1&#39;=>[
   	2,3,4,5,6
],
&#39;2&#39;=>[
        7,8,9,10
]
];
var_dump($arr[1][0]);
$num=count($arr[1]);
$sum=0;
for($ii=0; $ii<$num; $ii++) 
{
$sum=$sum+$arr[1][$ii];
}
var_dump($sum);
*/


/*一维数组的加和计算


$arr=[1,2,3,4,5,6,7,8,9,10];
$num=count($arr);
$sum=0;
for($ii=0; $ii<$num; $ii++) {
$sum+=$arr[$ii];
}
var_dump($sum);
*/
?>

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