note 37395 added to function.uksort
| From: | ignatius dot reilly at free dot fr | Date: | Thu, 13 Nov 2003 15:59:13 +0000 |
| Subject: | note 37395 added to function.uksort | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-60336@lists.php.net to get a copy of this message | ||
To use a more complicated comparison function, one can use a callback to a method of an object
instance.
For example the following will take an array $arr whose keys are the same as those of $reference,
and reorder $arr so that the keys appear in the same order as in $reference.
class kcmp {
var $reference ;
function kcmp( $reference ) {
$this->reference = $reference ;
}
function kcompare( $a, $b ) {
$keys = array_keys( $this->reference ) ;
$position_a = array_search( $a, $keys ) ;
$position_b = array_search( $b, $keys ) ;
return $position_a < $position_b ? -1 : 1 ;
}
}
$reference = array(
"k2" => "a2",
"k3" => "a3",
"k1" => "a1"
) ;
$arr = array(
"k1" => "b1",
"k2" => "b2",
"k3" => "b3"
) ;
print_r( $arr ) ;
uksort( $arr, array( new kcmp( $reference ), "kcompare" ) ) ;
print_r( $arr ) ;
----
Manual Page -- http://www.php.net/manual/en/function.uksort.php
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