使用自定义键进行阵列拼接

Question

说我有这个代码

$test = array();
$test['zero'] = 'abc';
$test['two'] = 'ghi';
$test['three'] = 'jkl';
dump($test);

array_splice($test, 1, 0, 'def');

dump($test);

这给了我输出

Array
(
    [zero] => abc
    [two] => ghi
    [three] => jkl
)

Array
(
    [zero] => abc
    [0] => def
    [two] => ghi
    [three] => jkl
)

无论如何我可以设置密钥,所以0可能不是one吗？在我需要的实际代码中,位置(本例中为1)和require键(本例中为1)将是动态的.

Answer 1

像这样的东西:

$test = array_merge(array_slice($test, 0, 1),
                    array('one'=>'def'),
                    array_slice($test, 1, count($test)-1));

或更短:

$test = array_merge(array_splice($test, 0, 1), array('one'=>'def'), $test);

更短:

$test = array_splice($test, 0, 1) + array('one'=>'def') + $test;

对于PHP> = 5.4.0:

$test = array_splice($test, 0, 1) + ['one'=>'def'] + $test;