multidim array sort

[Abhi]

Hi!

I am wondering if someone can point me to the needed sort function. There are so many of
them that I simply got lost by reading their descriptions. I try to explain what I need.

I have a multidimensiona l array and I have a function that outputs it as a table.

$arr[0] contains an array that contains usernames
$arr[1] contains an array that contains real names
$arr[2] contains an array that contains e-mails
etc...
$arr[last] contains integers for users "levels"

My function outputs users with their datas in the columns. Each column means one user.

Now I want to sort this whole array by levels. So, all other data should be sorted
according to the pattern in levels row.

How is this thing done?

Please advice!


Abhi

[Erwin Moller]

Re: multidim array sort

Abhi wrote:
[color=blue]
> Hi!
>
> I am wondering if someone can point me to the needed sort function. There
> are so many of them that I simply got lost by reading their descriptions.
> I try to explain what I need.
>
> I have a multidimensiona l array and I have a function that outputs it as a
> table.
>
> $arr[0] contains an array that contains usernames
> $arr[1] contains an array that contains real names
> $arr[2] contains an array that contains e-mails
> etc...
> $arr[last] contains integers for users "levels"
>
> My function outputs users with their datas in the columns. Each column
> means one user.
>
> Now I want to sort this whole array by levels. So, all other data should
> be sorted according to the pattern in levels row.
>
> How is this thing done?
>
> Please advice!
>
>
> Abhi[/color]

Hi Abhi,

You need array_multisort .

Here follows a basic example:

-----------------------------------
<?
$arr["username"] = array("John" , "Bert" , "Theo" , "Peter");
$arr["realname"] = array("Johnny Bravo" , "Bert Visser" , "Theo Maasen" ,
"Peter Hammil");
$arr["email"] = array("john@hot mail.com" , "bert@hotmail.c om" ,
"theo@yahoo.com " , "peer@gmail.com ");
$arr["level"] = array( 8 , 5 , 3 , 5);
?>
Before:
<pre>
<? print_r($arr); ?>
</pre>
<?
// sort
array_multisort ($arr["level"] , $arr["username"] , $arr["realname"] ,
$arr["email"]);
?>
<hr>
After:
<pre>
<? print_r($arr); ?>
</pre>

-------------------------------

When using array_multisort remember:
1) Your original arrays (the ones you feed to the function) will change
order, so no 'resultarray'. The function just return true on succes and
false on failure.
2) The ordering will be done in order of assigned arrays.
Or to put it more easily: look at the passed arrays as COLUMNS for a table.

Read it all at php.net.

Regards,
Erwin Moller