[SOLVED] Sorting a nested array in PHP

[Shaun_b]

Hi

 

I have a multidimensional (2D) array which looks like this:

 

$publications = [ [Title1, 2001, Link1], [Title2, 2008, Link2], [Title3, 2004, Link3], ... etc ]

 

What i would like to do is sort the nested arrays by year desending, like the following, keeping all the other values in the nested array associated with eachother.

 

$publications = [ [Title2, 2008, Link2], [Title3, 2004, Link3], [Title1, 2001, Link1], ... etc ]

 

Im rather new to PHP and all the stuff about sorting arrays is a bit overwhelming at the moment.

 

Thanks for any help.

 

Regards,

Shaun

[trq]

How is this array being created? If its created via a db query its likely better to do your sort there.

[Shaun_b]

It's created from data extracted from an XML file.

[Shaun_b]

All good, just found a solution to it:

 

usort($publications, "cmp");

function cmp($a, $b)
{
return ($b[Year] - $a[Year]);
}

 

This will sort the $publications array by the Year value descending. (Note that 'Year' is the named index of the year value).

 

Regards

 

Shaun.

 

[corbin]

You should enclose index names in quotes (or single quotes) unless you actually mean for them to be a constant.