如何以特定方式对 PHP 中的数组进行排序

Question

代码：

$array = array('even' => array(array('key' => 'test','key2' => 'Wn'), array('key' => 'test3', 'key2' => 'Bx')),
                'not_even' => array(array('key' => 'test2','key2' => 'Xn'), array('key' => 'test4', 'key2' => 'Gy')),
);

echo '<pre>';
print_r($array);
echo '</pre>';

输出：

Array
(
    [even] => Array
        (
            [0] => Array
                (
                    [key] => test
                    [key2] => Wn
                )

            [1] => Array
                (
                    [key] => test3
                    [key2] => Bx
                )

        )

    [not_even] => Array
        (
            [0] => Array
                (
                    [key] => test2
                    [key2] => Xn
                )

            [1] => Array
                (
                    [key] => test4
                    [key2] => Gy
                )

        )

)

我想对其进行排序，结果应该是：

Array
(
    [0] => Array
        (
            [key] => test
            [key2] => Wn
        )

    [1] => Array
        (
            [key] => test2
            [key2] => Xn
        )

    [2] => Array
        (
            [key] => test3
            [key2] => Bx
        )

    [3] => Array
        (
            [key] => test4
            [key2] => Gy
        )

)

那么怎么排序呢？数组中的键应该是：测试测试2 测试3 测试4。如何为此使用 foreach 或其他东西？什么是最好的解决方案。重要的是"key"，"key2"不重要。

Answer 1

您可以使用array_multisort()

尝试这样的事情：

foreach ($array as $key => $row) {
   $array1[$key]  = $row[0]; 
}

array_multisort($array1, SORT_DESC, $array);

Answer 2

试试这个

$array = array('even' => array(array('key' => 'test5','key2' => 'Wn'),    array('key' => 'test10', 'key2' => 'Bx')),
'not_even' => array(array('key' => 'test1','key2' => 'Xn'), array('key' => 'test', 'key2' => 'Gy')),
);

$new_array = array();

// changing  structure
foreach($array as $values){
$new_array = array_merge($new_array, $values);
}

// dump array
echo '<pre>';
print_r($new_array );
echo '</pre>';

// sorting
/// function for sorting
function cmp($a, $b)
{
   return strcasecmp($a['key'], $b['key']);
}

// sort by 'key' 
uksort($new_array, "cmp");

// dump array
echo '<pre>';
print_r($new_array );
echo '</pre>';

注意：这是字符串排序，所以 test 10 < test 5

Answer 3

试试这个例子，我已经在我的系统中测试过，它工作得很好。

<?php
$array = array('even' => array(array('key' => 'test','key2' => 'Wn'), array('key' => 'test3', 'key2' => 'Bx')),
                 'not_even' => array(array('key' => 'test2','key2' => 'Xn'), array('key' => 'test4', 'key2' => 'Gy')),
);
//Before Sorting
echo '<pre>';
print_r($array);
echo '</pre>';

$my_array = array();
foreach($array as $values){
$my_array = array_merge($my_array, $values);
}

//After Sorting
asort($my_array);
echo '<pre>';
print_r($my_array );
echo '</pre>'; 
?>

输出：-

Array
(
    [even] => Array
        (
            [0] => Array
                (
                    [key] => test
                    [key2] => Wn
                )

            [1] => Array
                (
                    [key] => test3
                    [key2] => Bx
                )

        )

    [not_even] => Array
        (
            [0] => Array
                (
                    [key] => test2
                    [key2] => Xn
                )

            [1] => Array
                (
                    [key] => test4
                    [key2] => Gy
                )

        )

)

Array
(
    [0] => Array
        (
            [key] => test
            [key2] => Wn
        )

    [2] => Array
        (
            [key] => test2
            [key2] => Xn
        )

    [1] => Array
        (
            [key] => test3
            [key2] => Bx
        )

    [3] => Array
        (
            [key] => test4
            [key2] => Gy
        )

)

我想这就是你需要的。

如何以特定方式对 PHP 中的数组进行排序

How to sort an array in PHP in a specific way

php

arrays

sorting

foreach

multidimensional-array