Question

我有一个像这样结构的数组 $ product_array sample =

[0] => Array
        (
            [title] => M-SPA Super Camaro B-150 6-Person Inflatable Bubble Spa
            [image] => http://ecx.images-amazon.com/images/I/41F6FuitoYL._SL160_.jpg
            [link] => http://www.amazon.com/stuff
            [price] => 960.01
            [merchant] => amazon
            [discount] => 16
            [brand] => M-SPA
        )

    [1] => Array
        (
            [title] => M Spa Model B-130 Camaro Hot Tub, 71 by 71 by 28-Inch, Gray
            [image] => http://ecx.images-amazon.com/images/I/41zQwjaPqOL._SL160_.jpg
            [link] => http://www.amazon.com/stuff
            [price] => 695.01
            [merchant] => amazon
            [discount] => 
            [brand] => M-SPA
        )

    [2] => Array
        (
            [title] => M-SPA B-121 4-Person Inflatable Bubble Spa, Castello
            [image] => http://ecx.images-amazon.com/images/I/41gnYSSVD5L._SL160_.jpg
            [link] => http://www.amazon.com/stuff
            [price] => 1,016.25
            [merchant] => amazon
            [discount] => 
            [brand] => M-SPA
        )

我不能以最低到最高的价格订购这个数组。此代码无效

function order_by_price($a, $b) {
  if ($a['price'] == $b['price']) {
        return 0;
    }
    return ($a['price'] < $b['price']) ? -1 : 1;
}
usort($product_array,order_by_price);

我错过了什么感谢

Answer 1

您在最后一个数组元素... [price] => 1,016.25 ...中有一个格式不正确的数字。
它是＆＃34; 货币格式＆＃34;并应以字符串形式显示：[price] => "1,016.25"。
此外，usort参数有一定的注意事项：

警告：从比较函数返回非整数值，比如float，会导致内部强制转换为整数回调的回报值。因此，诸如0.99和0.1之类的值都将是强制转换为0的整数值，这将比较这些值相等。

正确替换（格式化）后，如下所示更改代码：

function order_by_price($a, $b) {
    $floats = str_replace(",", "", [$a['price'], $b['price']]);
    return ($floats[0] == $floats[1])? 0 : (($floats[0] < $floats[1]) ? -1 : 1);
}

usort($product_array,"order_by_price");

以上将按预期工作......

php usort多维数组顺序按价格asc

1 个答案: