PHP - 将项目添加到关联数组的开头
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PHP - add item to beginning of associative array
提问by teepusink
How can I add an item to the beginning of an associative array? For example, say I have an array like this:
如何将项目添加到关联数组的开头？例如，假设我有一个这样的数组：
$arr = array('key1' => 'value1', 'key2' => 'value2');
When I add something to it as in $arr['key0'] = 'value0';, I get:
当我向它添加一些东西时$arr['key0'] = 'value0';，我得到：
Array
(
[key1] => value1
[key2] => value2
[key0] => value0
)Array
(
[key1] => value1
[key2] => value2
[key0] => value0
)How do I make that to be
我如何做到这一点
Array
(
[key0] => value0
[key1] => value1
[key2] => value2
)Array
(
[key0] => value0
[key1] => value1
[key2] => value2
)Thanks,
Tee
谢谢，
Tee
回答by Felix Kling
You could use the unionoperator:
您可以使用联合运算符：
$arr1 = array('key0' => 'value0') + $arr1;
or array_merge.
回答by outis
One way is with array_merge:
一种方法是array_merge：
<?php
$arr = array('key1' => 'value1', 'key2' => 'value2');
$arr = array_merge(array('key0' => 'value0'), $arr);
Depending on circumstances, you may also make use of ksort.
根据情况，您也可以使用ksort.
回答by Mark Baker
$array = array('key1' => 'value1', 'key2' => 'value2');
array_combine(array_unshift(array_keys($array),'key0'),array_unshift(array_values($array),'value0'))
回答by Tomek
function unshift( array & $array, $key, $val)
{
$array = array_reverse($array, 1);
$array[$key] = $val;
$array = array_reverse($array, 1);
return $array;
}
回答by James C
If you don't want to merge the arrays you could just use ksort()on the array before iterating over it.
如果你不想合并数组，你可以ksort()在迭代之前在数组上使用它。
