PHP:将关联数组元素移动到数组的开头

Question

将关联数组的任何元素移动到数组开头的最佳方法是什么？

例如，假设我有以下数组:

$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',
);

我想要做的是将“一个”元素移动到开头并以以下数组结束:

$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',
);

Answer 1

您可以使用数组联合运算符 (+) 使用已知键 (one) 将原始数组连接到新的关联数组。

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

数组键是唯一的，所以它不可能同时存在于两个位置。

请参阅文档 on Array Operators:

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.