On Monday, 18 April 2011 at 21:27, Ashley Sheridan wrote:
I'm trying to get the usort function working inside of a class, but am
> having some issues. Basically, the compare function which is the second
> parameter isn't recognised, but I'm not really sure how to indicate
> exactly where it is.
>
> I've gone over the usort() docs and read the user comments, and the only
> thing I've found so far which looked like it was the same issue gave
> this example:
>
>
>
> bo at erichsen dot com 20-Mar-2001 01:16
> when using usort to refer to a function inside a class i have
> succesfully used:
>
> <?php usort($myarray,array($this,"cmp")); ?>
>
> Unfortunately, that doesn't work either. A basic example is as follows:
>
>
> class Search_model extends Model
> {
> function get_results($q)
> {
> if(strlen($q))
> {
> $results = array();
>
> $words = explode(' ', $q);
> sort($words);
>
> // build the basic match query parts to be used for the content and
> blog tables
> if(substr($words[0], 0, 1) == '+' || substr($words[0], 0, 1) == '-'
> || substr($words[0], 0, 1) == '"')
> {
> $queryP1 = "SELECT *, MATCH(`content`) AGAINST('$q' IN BOOLEAN MODE)
> AS `score` FROM";
> $queryP2 = "WHERE MATCH(`content`) AGAINST('$q' IN BOOLEAN MODE)";
> }
> else
> {
> $queryP1 = "SELECT *, MATCH(`content`) AGAINST('$q') AS `score`
> FROM";
> $queryP2 = "WHERE `display`='yes' AND MATCH(`content`)
> AGAINST('$q')";
> }
>
>
> $sql = "$queryP1 `content` $queryP2";
> $query = $this->db->query($sql);
> foreach($query->result() as $row)
> {
> $results[] = $row;
> $results[count($result)-1]->content_type = 'content';
> }
>
> usort($results, array($this, "content_score_sort"));
> }
> }
>
> function content_score_sort($a, $b)
> {
> // custom sort function to sort pages based on their score, which is
> an array value within each page
> if($a['score'] == $b['score'])
> return 0;
> else
> return ($a['score'] > $b['score']) ? -1 : 1;
> }
> }
>
> I know it's probably something very simple, but for the life of me I
> can't find what I'm missing.
>
> I think in part it's that the normal way I know of calling that sort
> function from within the class is $this->content_score_sort(), but that
> isn't recognised either.
>
> If anyone can shed any light on this it'd be very welcome!
That is the correct way to specify it. Works fine for me:
http://dev.stut.net/php/usort.php
What makes you think it's not being recognised? I note that your get_results
method doesn't actually return anything, so how do you know the sort isn't
working?
-Stuart
--
Stuart Dallas
3ft9 Ltd
http://3ft9.com/
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