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php - 按多个字段对多维数组进行排序

问题描述

我发现了一些关于这个的问题，但我觉得我这里有一个非常特殊的情况，所以我要问一个新的。

我需要先按他们的标题（数组）然后按姓氏对用户数组进行排序，请考虑以下代码：

<?php
$users = [
    [
        'lastName' => 'Clarks',
        'titles' => ['Manager', 'Supervisor']
    ],
    [
        'lastName' => 'Clarkson',
        'titles' => ['Sales']
    ],
    [
        'lastName' => 'Adams',
        'titles' => ['Supervisor']
    ],
    [
        'lastName' => 'Adams',
        'titles' => ['Manager', 'Senior Manager']
    ],
    [
        'lastName' => 'Clarkson',
        'titles' => ['Manager']
    ],
    [
        'lastName' => 'Davids',
        'titles' => ['Senior Manager']
    ]
];

我想要的顺序是：

<?php
$order = [
    'Senior Manager',
    'Manager',
    'Supervisor'
];

如果有多个经理，他们应该按姓氏排序，所以这种情况下的输出将是：

<?php
$sorted = [
    [
        'lastName' => 'Adams',
        'titles' => ['Manager', 'Senior Manager']
    ],
    [
        'lastName' => 'Davids',
        'titles' => ['Senior Manager']
    ],
    [
        'lastName' => 'Clarks',
        'titles' => ['Manager', 'Supervisor']
    ],
    [
        'lastName' => 'Clarkson',
        'titles' => ['Manager']
    ],
    [
        'lastName' => 'Adams',
        'titles' => ['Supervisor']
    ],
    [
        'lastName' => 'Clarkson',
        'titles' => ['Sales']
    ]
];

我已经尝试过这些方面的东西，但无法让它工作并且发现它有点难以调试usort：

<?php
foreach ($order as $title) {
    usort($users, function ($a, $b) use ($title) {
        # Both have the title
        if (in_array($title, $a['titles']) and in_array($title, $b['titles']) ) {
            # Sort by name
            return strcmp($a['lastName'], $b['lastName']);
        }
        # A has the title
        elseif (in_array($title, $a['titles'])) {
            return 1;
        }
        # B has the title
        elseif (in_array($title, $b['titles'])) {
            return -1;
        }

        # No-one has the title
        return strcmp($a['lastName'], $b['lastName']);
    });
}

标签： phparraysusort

解决方案

问题是数组被一遍又一遍地排序。所以如果你在foreach循环中一步一步来，item首先按照高级经理职称排序，然后再按照经理职称排序，最后再按照主管职称排序。

所以首先，你必须颠倒你想要的顺序：

$order = array_reverse([
    'Senior Manager',
    'Manager',
    'Supervisor'
]);

如果它们都没有标题，那么你不想移动它们。因为在您的其他迭代中，您的高级经理可能没有主管头衔，而其他用户也可能没有头衔，因此他们俩都不应更改职位。所以你可以将最后一次返回更改为return 0;

最后，你已经反转了返回，1所以-1你只需要切换它们。

最后，最终代码如下所示：

$users = [
    [
        'lastName' => 'Clarks',
        'titles' => ['Manager', 'Supervisor']
    ],
    [
        'lastName' => 'Clarkson',
        'titles' => ['Sales']
    ],
    [
        'lastName' => 'Adams',
        'titles' => ['Supervisor']
    ],
    [
        'lastName' => 'Adams',
        'titles' => ['Manager', 'Senior Manager']
    ],
    [
        'lastName' => 'Clarkson',
        'titles' => ['Manager']
    ],
    [
        'lastName' => 'Davids',
        'titles' => ['Senior Manager']
    ]
];

$order = array_reverse([
    'Senior Manager',
    'Manager',
    'Supervisor'
]);

foreach ($order as $title) {
    usort($users, function ($a, $b) use ($title) {
        if (in_array($title, $a['titles']) && in_array($title, $b['titles'])) {
            return strcmp($a['lastName'], $b['lastName']);   
        }
        # A has the title
        elseif (in_array($title, $a['titles'])) {
            return -1;
        }
        # B has the title
        elseif (in_array($title, $b['titles'])) {
            return 1;
        }

        return 0;
    });   
}

输出将是：

array(6) {
  [0]=>
  array(2) {
    ["lastName"]=>
    string(5) "Adams"
    ["titles"]=>
    array(2) {
      [0]=>
      string(7) "Manager"
      [1]=>
      string(14) "Senior Manager"
    }
  }
  [1]=>
  array(2) {
    ["lastName"]=>
    string(6) "Davids"
    ["titles"]=>
    array(1) {
      [0]=>
      string(14) "Senior Manager"
    }
  }
  [2]=>
  array(2) {
    ["lastName"]=>
    string(6) "Clarks"
    ["titles"]=>
    array(2) {
      [0]=>
      string(7) "Manager"
      [1]=>
      string(10) "Supervisor"
    }
  }
  [3]=>
  array(2) {
    ["lastName"]=>
    string(8) "Clarkson"
    ["titles"]=>
    array(1) {
      [0]=>
      string(7) "Manager"
    }
  }
  [4]=>
  array(2) {
    ["lastName"]=>
    string(5) "Adams"
    ["titles"]=>
    array(1) {
      [0]=>
      string(10) "Supervisor"
    }
  }
  [5]=>
  array(2) {
    ["lastName"]=>
    string(8) "Clarkson"
    ["titles"]=>
    array(1) {
      [0]=>
      string(5) "Sales"
    }
  }
}

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