[SOLVED] Sorting an array in this way?

[m1key]

Hi,

 

I've got an array which currently looks like this:

 

array(3) {
  [0]=>
  array(5) {
    [0]=>
    int(1)
    [1]=>
    int(2)
    [2]=>
    int(3)
    [3]=>
    int(5)
    [4]=>
    int(9)
  }
  [1]=>
  array(5) {
    [0]=>
    int(2)
    [1]=>
    int(0)
    [2]=>
    int(6)
    [3]=>
    int(4)
    [4]=>
    int(16)
  }
  [2]=>
  array(5) {
    [0]=>
    int(3)
    [1]=>
    int(1)
    [2]=>
    int(5)
    [3]=>
    int(4)
    [4]=>
    int(11)
  }
}

 

How can I sort it so that it sorts on index value '4' descending - i.e, I want the array to look like this:

 

array(3) {
  [0]=>
  array(5) {
    [0]=>
    int(2)
    [1]=>
    int(0)
    [2]=>
    int(6)
    [3]=>
    int(4)
    [4]=>
    int(16) <--------- Highest value
  }
  [1]=>
  array(5) {
    [0]=>
    int(3)
    [1]=>
    int(1)
    [2]=>
    int(5)
    [3]=>
    int(4)
    [4]=>
    int(11)
  }
  [2]=>
  array(5) {
    [0]=>
    int(1)
    [1]=>
    int(2)
    [2]=>
    int(3)
    [3]=>
    int(5)
    [4]=>
    int(9) <--------- Lowest value
  }
}

 

Cheers,

 

Mike.

[laffin]

array_sort($myarray[3])

[sasa]

look usort() function

[m1key]

Hi,

 

Many thanks for the response. I'm not sure if usort() will be entirely appropriate, because this array is essentially a collection of user-collected data, and could possibly contain 50+ sets. I only included 3 sets in my example above for comparison purposes.

 

Apologies for not stating this in my original post

[laffin]

so do u want to sort all arrays or only specific ones?

 

if u are sorting all arrays, u will be looking at a recursive sort routine (which checks for any arrays within the main array)

 

[m1key]

Ah, I think I was after usort() after all! This PHP lark is confusing sometimes 

 

This did what I was after:

 

function highest($b, $a)

{ return $a[4] > $b[4];

}

usort($finalResults,'highest');

 

Thanks for the help!