PHP - 用相同的键对一个或多个值求和答案

【问题标题】：PHP - sum one or more values with the same keyPHP - 用相同的键对一个或多个值求和
【发布时间】：2022-08-18 20:12:55
【问题描述】：

对于每种不同的颜色，用相同的 \'color\' 对 \'val\',\'val1\',\'val2\' 字段求和的最佳方法是什么：

我有以下数组格式。如果颜色具有相同的值，则在该数组中添加键值。请帮帮我。提前致谢

Array
(
    [0] => Array
        (
            [color]=> \"red\"
            [val]=> 4
            [val1]=> 4
            [val2]=> 4
        )    
    [1] => Array
        (
            [color]=> \"green\"
            [val]=> 3
            [val1]=> 3
            [val2]=> 3
        )    
    [2] => Array
        (
            [color]=> \"blue\"
            [val]=> 1
            [val1]=> 3
            [val2]=> 3
        )    
    [3] => Array
        (
            [color]=> \"green\"
            [val]=> 6
            [val1]=> 3
            [val2]=> 3
        )    
    [4] => Array
        (
            [color]=> \"blue\"
            [val]=> 2
            [val1]=> 3
            [val2]=> 3
        )
)

我想要的结果：

 (
        [color] => red
        [val] => 4
        [val1] => 4
        [val2] => 4
        
    )
    (
        [color] => green
        [val] => 9
        [val1] => 6
        [val2] => 6
        
    )
    (
        [color] => blue
        [val] => 3
        [val1] => 6
        [val2] => 6
        
    )

标签： php arrays

【解决方案1】：

遍历数组并使用颜色作为键。

$array = [
    [
        'color' => "red",
        'val'   => 4,
        'val1'  => 4,
        'val2'  => 4,
    ],
    [
        'color' => "green",
        'val'   => 3,
        'val1'  => 3,
        'val2'  => 3,
    ],
    [
        'color' => "blue",
        'val'   => 1,
        'val1'  => 3,
        'val2'  => 3,
    ],
    [
        'color' => "green",
        'val'   => 6,
        'val1'  => 3,
        'val2'  => 3,
    ],
    [
        'color' => "blue",
        'val'   => 2,
        'val1'  => 3,
        'val2'  => 3,
    ],
];

$colors = [];
foreach ($array as $item) {
    foreach (['val', 'val1', 'val2'] as $key) {
        $colors[$item['color']][$key] = ($colors[$item['color']][$key] ?? 0) + $item[$key];
    }
}

print_r($colors);

将导致

Array
(
    [red] => Array
        (
            [val] => 4
            [val1] => 4
            [val2] => 4
        )

    [green] => Array
        (
            [val] => 9
            [val1] => 6
            [val2] => 6
        )

    [blue] => Array
        (
            [val] => 3
            [val1] => 6
            [val2] => 6
        )

)

【讨论】：

【解决方案2】：

您可以使用Foreach 循环来实现，并在循环内进行加法计算。

$baseArray = [
    [
        'color' => "red",
        'val'   => 4,
        'val1'  => 4,
        'val2'  => 4,
    ],
    [
        'color' => "green",
        'val'   => 3,
        'val1'  => 3,
        'val2'  => 3,
    ],
    [
        'color' => "blue",
        'val'   => 1,
        'val1'  => 3,
        'val2'  => 3,
    ],
    [
        'color' => "green",
        'val'   => 6,
        'val1'  => 3,
        'val2'  => 3,
    ],
    [
        'color' => "blue",
        'val'   => 2,
        'val1'  => 3,
        'val2'  => 3,
    ],
];

$colorsArray = [];
$arrayKeys = ['val', 'val1', 'val2'];

foreach ($baseArray as $item) {
    foreach ($arrayKeys as $keyName) {
        $colorsArray[$item['color']]['color'] = $item['color'];
        $colorsArray[$item['color']][$keyName] = ($colorsArray[$item['color']][$keyName] ?? 0) + $item[$keyName];
    }
}

$colorsArray = array_values($colorsArray);

print_r($colorsArray);

输出：

Array
(
    [0] => Array
        (
            [color] => red
            [val] => 4
            [val1] => 4
            [val2] => 4
        )

    [1] => Array
        (
            [color] => green
            [val] => 9
            [val1] => 6
            [val2] => 6
        )

    [2] => Array
        (
            [color] => blue
            [val] => 3
            [val1] => 6
            [val2] => 6
        )
)

【讨论】：