如何解决从几个较小的数量中减去一个大的数量
array(
key1 => 2,key2 => 5,key3 => 10,keyn => n.
)
我试图从中减去 12 并相应地减少值并更新数组:
key1 => 0 (2 - 12 is -10,so I leave 0)
key2 => 0 (10 left from the first subtraction,so I subtract 10 from the second value,as the result is -5,I leave 0)
key3 => 5 (5 left from the above subtraction so I subtract 5 from 10)
keyn => n (other values not affected by the subtraction should remain unchanged).
解决方法
试试这个:
$input = array(
"key1" => 2,"key2" => 5,"key3" => 10,);
$rest = 12;
foreach ($input as $key => $value) {
$newValue = $value - $rest;
$rest = 0;
if ($newValue < 0) {
$rest = $newValue *= -1;
$newValue = 0;
}
$output[$key] = $newValue;
}
var_dump($output);
输出:
array(3) {
["key1"]=>
int(0)
["key2"]=>
int(0)
["key3"]=>
int(5)
}
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