I have the following array:

```
array(5) {

    [0]=> array(3) {
        [0]=> string(10) "2013-09-18"
        [1]=> string(75) "Ready For Retina HD: Create Pixel-Perfect Assets For Multiple Scale Factors"
        [2]=> string(74) "ready-for-retina-hd-create-pixel-perfect-assets-for-multiple-scale-factors"
    }
    [1]=> array(3) {
        [0]=> string(10) "2010-10-20"
        [1]=> string(40) "Taking A Closer Look At Tech Conferences"
        [2]=> string(40) "taking-a-closer-look-at-tech-conferences"
    }
    [2]=> array(3) {
        [0]=> string(10) "2014-10-19"
        [1]=> string(29) "Wayfinding For The Mobile Web"
        [2]=> string(29) "wayfinding-for-the-mobile-web"
    }
    [3]=> array(3) {
        [0]=> string(10) "2014-05-15"
        [1]=> string(24) "Freebie: Icons Of Autumn"
        [2]=> string(23) "freebie-icons-of-autumn"
    }

    [4]=> &array(1){
        [0]=> string(0) ""
    }
}

```

How would I go about assigning key names to each part of the inner array? E,g date, title, pathname.

I understand you can do something like this to create an array with certain keys, but how does this work with multiple nested arrays? And how can it be assigned after array creation?

```
$keys = array('Date', 'Title', 'Filepath');

```