note 40652 added to function.usort
| From: | robert at sargant dot com | Date: | Wed, 10 Mar 2004 18:40:18 +0000 |
| Subject: | note 40652 added to function.usort | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-66575@lists.php.net to get a copy of this message | ||
This is an extension to Todor's function below - it will sort a multidimensional array by a
primary key, secondary key and so on. It uses the same method of passing arguments as
array_multisort, including sort order flags (but not sort type flags - arrays are sorted as
case-insensitive strings.)
<?php
function array_alternate_multisort()
{
$arguments = func_get_args();
$arrays = $arguments[0];
for ($c = (count($arguments)-1); $c > 0; $c--)
{
if (in_array($arguments[$c], array(SORT_ASC , SORT_DESC)))
{
continue;
}
$compare = create_function('$a,$b','return
strcasecmp($a["'.$arguments[$c].'"],
$b["'.$arguments[$c].'"]);');
usort($arrays, $compare);
if ($arguments[$c+1] == SORT_DESC)
{
$arrays = array_reverse($arrays);
}
}
return $arrays ;
}
?>
To demonstrate:
<?php
$dir_contents[] = array("is_dir" => 0, "name" => "b.jpg");
$dir_contents[] = array("is_dir" => 1, "name" => "e");
$dir_contents[] = array("is_dir" => 1, "name" => "a");
$dir_contents[] = array("is_dir" => 0, "name" => "d.png");
$dir_contents[] = array("is_dir" => 0, "name" => "c.png");
$dir_sorted = array_alternate_multisort($dir_contents, "is_dir", SORT_DESC,
"name", SORT_ASC);
print_r($dir_sorted);
?>
Produces the output:
Array
(
[0] => Array
(
[is_dir] => 1
[name] => a
)
[1] => Array
(
[is_dir] => 1
[name] => e
)
[2] => Array
(
[is_dir] => 0
[name] => b.jpg
)
[3] => Array
(
[is_dir] => 0
[name] => c.png
)
[4] => Array
(
[is_dir] => 0
[name] => d.png
)
)
----
Manual Page -- http://www.php.net/manual/en/function.usort.php
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