php php关联数组键顺序（非排序）

php associative array key order (not sort)

提问by nizzle

My array:

我的阵列：

$data = array('two' => 2, 'one' => 1, 'three' => 3);

Now, with when I iterate the array, the first value that will come up will probably be

现在，当我迭代数组时，出现的第一个值可能是

$data['two'] // = 2 @ index[0]

right?

对？

What if I want to move the $data[1] to the position of $data[0] ?

如果我想将 $data[1] 移动到 $data[0] 的位置怎么办？

To rephrase:

改写：

How do I make the array look like this (so that 'one' comes up at $data[0])

我如何使数组看起来像这样（以便“一个”出现在 $data[0] 处）

$data = array('one' => 1, 'two' => 2, 'three' => 3

Why do I need this?

为什么我需要这个？

I use code igniter, the table->generate built-in function takes an assoc array and creates a table but offers no method of arranging the columns. This is why I would like to move the columns in the source array.

我使用代码点火器，table->generate 内置函数接受一个 assoc 数组并创建一个表，但没有提供排列列的方法。这就是为什么我想移动源数组中的列。

采纳答案by Mark Baker

Take a look at daniele centamore's commenton PHP's array_splice()function, where he provides a couple of functions for moving the elements in an non-associative array.

看看daniele centamore对 PHP 的array_splice()函数的评论，他提供了几个函数来移动非关联数组中的元素。

<?php

// $input  (Array) - the array containing the element
// $index (int) - the index of the element you need to move

function moveUp($input,$index) {
      $new_array = $input;

       if((count($new_array)>$index) && ($index>0)){
                 array_splice($new_array, $index-1, 0, $input[$index]);
                 array_splice($new_array, $index+1, 1);
             } 

       return $new_array;
}

function moveDown($input,$index) {
       $new_array = $input;

       if(count($new_array)>$index) {
                 array_splice($new_array, $index+2, 0, $input[$index]);
                 array_splice($new_array, $index, 1);
             } 

       return $new_array;
}  

$input = array("red", "green", "blue", "yellow");

$newinput = moveUp($input, 2);
// $newinput is array("red", "blue", "green", "yellow")

$input = moveDown($newinput, 1);
// $input is array("red", "green", "blue", "yellow")

?>

回答by Diego Pino

Two possible solutions (without using array_splice):

两种可能的解决方案（不使用array_splice）：

1) Create a new array with the new order of the keys.

1) 使用新的键顺序创建一个新数组。

$new_keys = array('one', 'two', 'three');
$new_data = array();
foreach ($new_keys as $key) {
    $new_data[$key] = $data[$key];
}
$data = $new_data;

2) Move the element oneupfront, remove it from $dataand copy the rest of the array.

2) 将元素one向前移动，将其从$data数组中移除并复制数组的其余部分。

function rearrangeData($data) {
    $result['one'] = $data['one'];
    unset($data['one']);
    return array_merge($result, $data);
}    
$data = rearrangeData($data);

回答by oriadam

See ksortand uksort.

见ksort和uksort。

Here's a working example:

这是一个工作示例：

<?php

$data = array('two' => 2, 'one' => 1, 'three' => 3);
print_r($data);
ksort($data);
echo "ksort:\n";
print_r($data);
uksort($data,'cmp');
echo "uksort:\n";
print_r($data);
function cmp($a, $b)
{
    $num=' one two three four five six seven eight nine ten';
    $ai = stripos($num,$a);
    $bi = stripos($num,$b);
    if ($ai>0 && $bi>0) {
        return ($ai > $bi) ? 1 : -1;
    }
    return strcasecmp($a, $b);
}

Output:

输出：

Array
(
    [two] => 2
    [one] => 1
    [three] => 3
)
ksort:
Array
(
    [one] => 1
    [three] => 3
    [two] => 2
)
uksort:
Array
(
    [one] => 1
    [two] => 2
    [three] => 3
)

Run this: http://codepad.org/yAK1b1IP

运行这个：http: //codepad.org/yAK1b1IP

回答by Dan Grossman

PHP has 13 functions for sorting arrays, by key, by value, by user-defined functions where you can specify that "one" comes before "two". There's also array_shift, array_unshift, array_push and array_pop for moving things onto or off the front or end of the array. You can build a whole new array from the existing one.

PHP 有13 个用于按键、按值、按用户定义的函数对数组进行排序的函数，您可以在其中指定“一”在“二”之前。还有 array_shift、array_unshift、array_push 和 array_pop 用于将事物移入或移出数组的前端或后端。您可以从现有阵列构建一个全新的阵列。

回答by Distdev

I think, you should use asort function:

我认为，你应该使用 asort 函数：

$data = array('two' => 2, 'one' => 1, 'three' => 3);

$dataOrdered = $data;
asort($dataOrdered);

Run this code

运行此代码