Sort array without index

[christiang@lateral.net]

Hi guys I'd like to sort a multidimensiona l array that hasn't numerical
index, in fact it is like:

Array
(
[mobile] => Array
(
[name_str] => mobile
[relationCount_i nt] => 1
)

[video] => Array
(
[name_str] => video
[relationCount_i nt] => 2
)

[flash] => Array
(
[name_str] => flash
[relationCount_i nt] => 1
)

[tool] => Array
(
[name_str] => tool
[relationCount_i nt] => 1
)

)

And I'd like to sort, for instance for the value of
"relationCount_ int", so the new order should be something like:

Array
(
[video] => Array
(
[name_str] => video
[relationCount_i nt] => 2
)
[mobile] => Array
(
[name_str] => mobile
[relationCount_i nt] => 1
)


[flash] => Array
(
[name_str] => flash
[relationCount_i nt] => 1
)

[tool] => Array
(
[name_str] => tool
[relationCount_i nt] => 1
)

)

Any idea? I tried some script I found on php.net but didn't work. The
could should run inside a class method.

Thanks a lot, chr

[Erwin Moller]

Re: Sort array without index

christiang@late ral.net wrote:
[color=blue]
> Hi guys I'd like to sort a multidimensiona l array that hasn't numerical
> index, in fact it is like:
>
> Array
> (
> [mobile] => Array
> (
> [name_str] => mobile
> [relationCount_i nt] => 1
> )
>
> [video] => Array
> (
> [name_str] => video
> [relationCount_i nt] => 2
> )
>
> [flash] => Array
> (
> [name_str] => flash
> [relationCount_i nt] => 1
> )
>
> [tool] => Array
> (
> [name_str] => tool
> [relationCount_i nt] => 1
> )
>
> )
>
> And I'd like to sort, for instance for the value of
> "relationCount_ int", so the new order should be something like:
>
> Array
> (
> [video] => Array
> (
> [name_str] => video
> [relationCount_i nt] => 2
> )
> [mobile] => Array
> (
> [name_str] => mobile
> [relationCount_i nt] => 1
> )
>
>
> [flash] => Array
> (
> [name_str] => flash
> [relationCount_i nt] => 1
> )
>
> [tool] => Array
> (
> [name_str] => tool
> [relationCount_i nt] => 1
> )
>
> )
>
> Any idea? I tried some script I found on php.net but didn't work. The
> could should run inside a class method.
>
> Thanks a lot, chr[/color]


Hi

Yes, it is easy if you use uksort().

-----------------------------------
uksort

(PHP 3 >= 3.0.4, PHP 4, PHP 5)
uksort -- Sort an array by keys using a user-defined comparison function
-----------------------------------

Read more here:

http://nl2.php.net/manual/en/function.uksort.php

Regards,
Erwin Moller

[christiang@lateral.net]

Re: Sort array without index

Hi Erwin, I tried in many ways, using also usort but it doesn't work.
This is my last test:

- iniside the method of the class -
usort($arr, array ($this,"cmp"));

function cmp($a, $b)
{
if ($a['relationCount_ int'] == $b['relationCount_ int']) {
return 0;
}
return ($a['relationCount_ int'] > $b['relationCount_ int']) ? -1 : 1;
}

debugging it is comparing the right values, but the order doesn't
change. Could be the fact that the array has as index a string instead
of number? Cheers, chr

[christiang@lateral.net]

Re: Sort array without index

Actually, I tried the sorting outside my class and it works properly:

$arr = array();
$arr['del.icio.us'] = array( "relationCount_ int" => 1, "name_str" =>
"del.icio.u s");
$arr['php'] = array( "relationCount_ int" => 1, "name_str" => "php");
$arr['framework'] = array( "relationCount_ int" => 2, "name_str" =>
"framework" );
$arr['javascript'] = array( "relationCount_ int" => 3, "name_str" =>
"javascript ");
$arr['google'] = array( "relationCount_ int" => 1, "name_str" =>
"google");
$arr['xml'] = array( "relationCount_ int" => 1, "name_str" => "xml");
$arr['RIA'] = array( "relationCount_ int" => 1, "name_str" => "RIA");
$arr['library'] = array( "relationCount_ int" => 1, "name_str" =>
"library");
$arr['design'] = array( "relationCount_ int" => 1, "name_str" =>
"design");
$arr['development'] = array( "relationCount_ int" => 2, "name_str" =>
"developmen t");
$arr['webdesign'] = array( "relationCount_ int" => 1, "name_str" =>
"webdesign" );
$arr['web'] = array( "relationCount_ int" => 1, "name_str" => "web");

function cmp($a, $b)
{
//print_r($a['relationCount_ int']." ==
".$b['relationCount_ int']."<br>");
if ($a['relationCount_ int'] == $b['relationCount_ int']) {
return 0;
}
return ($a['relationCount_ int'] > $b['relationCount_ int']) ? -1 : 1;
}

usort($arr, "cmp");


print "<pre>";
print_r($arr);
print "</pre>";

I have problem on modifying the array of my class, I tried even to
remove the elements but I can't:

foreach($this->relatedtags_ar r as $relatedtag){
unset($this->relatedtags_ar r[$relatedtag['name_str']]);
}

Although the count() becomes 0, the elements are still there. How could
modify that array, and how could I do inside my class? Any idea? Thanks
a lot, chr

[F Laupretre]

Re: Sort array without index

Le Tue, 07 Feb 2006 21:10:57 +0100, <christiang@lat eral.net> a écrit:
[color=blue]
> Actually, I tried the sorting outside my class and it works properly:[/color]
....[color=blue]
> usort($arr, "cmp");[/color]


If you want to keep the key associations, you must use uasort() instead of
usort().
[color=blue]
> I have problem on modifying the array of my class, I tried even to
> remove the elements but I can't:
>
> foreach($this->relatedtags_ar r as $relatedtag){
> unset($this->relatedtags_ar r[$relatedtag['name_str']]);[/color]

Why do you replicate your key in the value ? Seems very complex without
need. You can keep only the key and sort on it, event with a user compare
function (with uksort). But maybe the best solution would be the opposite
method : removing the string keys and keeping the value field...

You can compare on any field with the following code inside your class :

var $field;
var $a; // Array

function sort_array($fie ld)
{
$this->field=$field ;
uasort($a,$a,$t his->cmp);
}

function cmp($a1,$a2)
{
return strcmp($a1[$this->field],$a2[$this->field]);
}
//-- End of class

And you sort your array with something like :

$object->sort_array('fi eld_name');