Sorting multidim arrays

[sirugo]

I have an multidimensional array.

Lets' say its elements are:

h 1 r 9
a 3 d 4
c 2 f 5
b 9 g 8

How can I sort it, keeping the values on the "same row"?
Let's say I want to sort it with the first column as sort-value:

a 3 d 4
b 9 g 8
c 2 f 5
h 1 r 9

or the third column:

a 3 d 4
c 2 f 5
b 9 g 8
h 1 r 9

 

[skiflyer]

You're going to want to read up on

http://www.php.net/manual/en/function.usort.php

or maybe

http://www.php.net/manual/en/functions.uasort.php

Without going into more detail than I have time for, you just need to write a comparison like

function myCmp1($a, $b) {
  if ($a[1] == $b[1]) {
        return 0;
  }
  return ($a[1] < $b[1]) ? -1 : 1;  
}

For one of those functions.

-Rob