PHP：如果值是数字，如何将数组项移动到第一位而不更改其键？

Here is my array:

这是我的阵列:

$arrayA = array(0 => "someString",
                1 => "otherString",
                2 => "2017",
                3 => "anotherString",
                4 => "2016"); 
$arrayA = array(0