如何总计数组列？

Question

我有数据

A = 100 我想这样输出

  

数量| qty_sisa

10    A-10 = 90
20    90-20 = 70
30    70-30 = 40
40    40-40 = 0

Answer 1

您可以使用foreach

$a = array();
$b = array();
foreach (array_keys($a - $b) as $key) {
    $c[$key] = $a[$key] - $b[$key];
}