Solved

# sort a multi dimensional array

Posted on 2003-12-09
238 Views
If made a multiple dimension array which looks like this:

\$result[\$i] = array('type' => 'pagina', 'id' => \$row['id'], 'titel' => \$row['titel'], 'intro' => \$row['intro'], 'score' => \$row['score']);

now I would like to sort it on score (highest on top).

array_multisort() claims it can do this, but i don't understand this function ( http://www.php.net/manual/nl/function.array-multisort.php ) So maybe someone can tell me how the code should look like..

Emiel
0
Question by:EmielElgersma
• 2

LVL 3

Accepted Solution

red010knight earned 20 total points
From the looks of it you are pulling this from a database. If that is the case, the database call should be able to sort the data for you.

In MySQL the Query would be:
\$sqlQuery="SELECT * FROM test SORT BY score DESC";

as to the way you sort... Multisort should be avoided. As it is complex and rather crazy.
If you are just sorting by one field... you should be able to do sort(\$result[\$i]['score']); I think, or just write a quick bubble sort that would look something like:
<?php
// init var
\$RESSIZE = sizeof(\$result ) ;
\$i=0;
\$aux=0;
\$change = true;

// the sort
while( \$i<\$RESSIZE-1):
\$j=0;
while( \$j < \$RESSIZE):
if( \$arr[\$i] < \$arr[\$j] ):
\$aux = \$arr[\$i];
\$arr[\$i] = \$arr[\$j];
\$arr[\$j] = \$aux;
endif;
\$j++;
endwhile;
\$i++;
endwhile;
?>
0

LVL 33

Expert Comment

red010knight is right if you are using a db query - much easier to let the db sort for you.

The array_multisort syntax would be:
\$sortedArray = array_multisort(\$result['score'], \$result['type'], \$result['id'], \$result['titel'], \$result['intro']);

This will sort by score, then type, then id, then titel (sic), then intro.
0

LVL 33

Expert Comment

It's been a while since the last post.  Is the problem solved?
0

LVL 34

Expert Comment

Here's a GREAT sorting function that I just got from the comments in the array_multisort help page:

-----------------------------------------------------
function array_csort() {  //coded by Ichier2003
\$args = func_get_args();
\$marray = array_shift(\$args);

\$msortline = "return(array_multisort(";
foreach (\$args as \$arg) {
\$i++;
if (is_string(\$arg)) {
foreach (\$marray as \$row) {
\$sortarr[\$i][] = \$row[\$arg];
}
} else {
\$sortarr[\$i] = \$arg;
}
\$msortline .= "\\$sortarr[".\$i."],";
}
\$msortline .= "\\$marray));";

eval(\$msortline);
return \$marray;
}
-----------------------------------------------------

It's EXTREMELY easy to use and very scalable - I just incorporated into a project no less than a few minutes ago (I found this while searching for help on the same subject).

Let's say I have an array that looks like this:

\$MDArray[] = array("Name" => "Product 1", "Features" => "5", "Price" => "10.00");
\$MDArray[] = array("Name" => "Product 2", "Features" => "5",  "Price" => "25.00");
\$MDArray[] = array("Name" => "Product 3", "Features" => "6",  "Price" => "50.00");
\$MDArray[] = array("Name" => "Product 4", "Features" => "7",  "Price" => "100.00");

I could easily sort this by either Name, Features, or Price. To sort by ascending price, for example:
\$MDArray = array_csort(\$MDArray, "Price", SORT_ASC);

To sort by most expensive first:
\$MDArray = array_csort(\$MDArray, "Price", SORT_DESC);

Or to sort by most features first and then by cheapest price:
\$MDArray = array_csort(\$MDArray, "Features", SORT_DESC, "Price", SORT_ASC);

This is a great tool. Thanks Ichier.

- Jonathan
0

## Featured Post

### Suggested Solutions

Deprecated and Headed for the Dustbin By now, you have probably heard that some PHP features, while convenient, can also cause PHP security problems.  This article discusses one of those, called register_globals.  It is a thing you do not want.  …
I imagine that there are some, like me, who require a way of getting currency exchange rates for implementation in web project from time to time, so I thought I would share a solution that I have developed for this purpose. It turns out that Yaho…
Learn how to match and substitute tagged data using PHP regular expressions. Demonstrated on Windows 7, but also applies to other operating systems. Demonstrated technique applies to PHP (all versions) and Firefox, but very similar techniques will w…
The viewer will learn how to create and use a small PHP class to apply a watermark to an image. This video shows the viewer the setup for the PHP watermark as well as important coding language. Continue to Part 2 to learn the core code used in creat…