PHP:将关联数组元素移动到数组的开头 [英] PHP: Move associative array element to beginning of array

问题描述

将关联数组的任何元素移到数组开头的最佳方法是什么?

What would be the best method of moving any element of an associative array to the beginning of the array?

例如，说我有以下数组:

For example, say I have the following array:

$myArray = array(
    'two'   => 'Blah Blah Blah 2',
    'three' => 'Blah Blah Blah 3',
    'one'   => 'Blah Blah Blah 1',
    'four'  => 'Blah Blah Blah 4',
    'five'  => 'Blah Blah Blah 5',
);

我想做的是将'one'元素移到开头并以以下数组结尾:

What i want to do is move the 'one' element to the beginning and end up with the following array:

$myArray = array(
    'one'   => 'Blah Blah Blah 1',
    'two'   => 'Blah Blah Blah 2',
    'three' => 'Blah Blah Blah 3',
    'four'  => 'Blah Blah Blah 4',
    'five'  => 'Blah Blah Blah 5',
);

推荐答案

您可以使用数组联合运算符(+)通过已知键(one)将原始数组连接到新的关联数组. /p>

You can use the array union operator (+) to join the original array to a new associative array using the known key (one).

$myArray = array('one' => $myArray['one']) + $myArray;
// or      ['one' => $myArray['one']] + $myArray;

阵列键是唯一的，因此不可能在两个位置都存在.

请参阅php.net/manual/en/language.operators.array.php:

Please see php.net/manual/en/language.operators.array.php:

+运算符返回添加到左侧数组的右侧数组；对于两个数组中都存在的键，将使用左侧数组中的元素，而右侧数组中的匹配元素将被忽略.

The + operator returns the right-hand array appended to the left-hand array; for keys that exist in both arrays, the elements from the left-hand array will be used, and the matching elements from the right-hand array will be ignored.

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