数组类

一、随机打乱多维数组的顺序（key 不变）

• 请求参数类型：Array

• 返回值类型：Array

• 返回值含义：返回被打乱顺序（但 key 不变）的数组

public function shuffleDoubleArray($doubleArray)
{
    if (!is_array($doubleArray)) {
        return $doubleArray;
    }
    $keys = array_keys($doubleArray);
    shuffle($keys);
    $random = array();
    foreach ($keys as $key) {
        $random[$key] = $doubleArray[$key];
    }
    return $random;
}

$obj = new ArrayHandle();
$arr = [
    0 => [
        'name' => 'tomlibao',
        'age' => 24
    ],
    1 => [
        'name' => '光头强',
        'age' => 20
    ],
    2 => [
        'name' => '潮巴蛋',
        'age' => 30
    ]
];
$res = $obj->shuffleDoubleArray($arr);
print_r($res);

输出：

Array
(
    [1] => Array
        (
            [name] => 光头强
            [age] => 20
        )

    [2] => Array
        (
            [name] => 潮巴蛋
            [age] => 30
        )

    [0] => Array
        (
            [name] => tomlibao
            [age] => 24
        )

)

二、对二维数组的某个列进行正倒叙排列

• 请求参数类型：Array，string，常量（非字符串，正序：SORT_ASC，倒序：SORT_DESC）

• 返回值类型：Array

• 返回值含义：返回被打乱顺序（但 key 不变）的数组

public function arraySort($doubleArray, $keys, $sort = SORT_DESC)
{
    $keysValue = [];
    foreach ($doubleArray as $k => $v) {
        $keysValue[$k] = $v[$keys];
    }
    array_multisort($keysValue, $sort, $doubleArray);
    return $doubleArray;
}

$obj = new ArrayHandle();
$arr = [
    0 => [
        'name' => 'tomlibao',
        'age' => 24
    ],
    1 => [
        'name' => '光头强',
        'age' => 20
    ],
    2 => [
        'name' => '潮巴蛋',
        'age' => 30
    ]
];
$res = $obj->arraySort($arr ,'age', SORT_ASC);
print_r($res);

输出：

Array
(
    [0] => Array
        (
            [name] => 光头强
            [age] => 20
        )

    [1] => Array
        (
            [name] => tomlibao
            [age] => 24
        )

    [2] => Array
        (
            [name] => 潮巴蛋
            [age] => 30
        )

)

info

注意：第三个参数不能使用字符串，而是使用常量。

三、获取多维数组某一列的总和

• 请求参数类型：Array，string

• 返回值类型：string

• 返回值含义：返回多维数组某一列计算后的总和

$obj = new ArrayHandle();
$arr = [
    0 => [
        'name' => 'tomlibao',
        'age' => 24
    ],
    1 => [
        'name' => '光头强',
        'age' => 20
    ],
    2 => [
        'name' => '潮巴蛋',
        'age' => 30
    ]
];
$res = $obj->getArrFieldSum($arr ,'age');
print_r($res);

public function getArrFieldSum($doubleArray, $field)
{
    $array = array_column($doubleArray, $field);
    return array_sum($array);
}

输出：74