我有两个关联数组.我需要减去($price – $tax)以获得$total总价:
$price['lunch'] = array("food" => 10, "beer"=> 6, "wine" => 9);
$price['dinner'] = array("food" => 15, "beer"=> 10, "wine" => 10);
$tax['lunch'] = array("food" => 2, "beer"=> 3, "wine" => 2);
$tax['dinner'] = array("food" => 4, "beer"=> 6, "wine" => 4);
期望的结果数组:
$result['lunch'] = (['food'] => 8, ['beer'] =>3, ['wine'] => 7 )
$result['dinner'] = (['food'] => 11, ['beer'] =>4, ['wine'] => 6 )
我正在尝试跟随函数和array_map无济于事:
function minus($a, $b) {
return $a - $b;
}
foreach ($price as $value)
{
$big = $value;
foreach($tax as $v) {
$small = $v;
$e[] = array_map("minus",$big, $small);
}
}
在上面我得到四个数组(第一个和最后一个是正确的),所以它是不正确的.感谢您的任何信息!
解决方法:
您可以使用键而不是数组映射进行比较.使用双重foreach,您可以做任意数量的膳食和食物类型:
foreach(array_keys($price) as $meal)
{
foreach(array_keys($price[$meal]) as $type)
{
$e[$meal][$type] = $price[$meal][$type] - $tax[$meal][$type];
}
}
请注意,此代码不会在膳食或食物类型中查找丢失的物品……
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