Utiliser une méthode comme fonction de comparaison dans une classe - Use a method as a comparison function in a class
Publié le .Il peut être utile d'utiliser une fonction de comparaison dans une classe en PHP. Mais si on suit le style procédural, on va tomber sur une erreur du type " cannot redeclare ... " Et c'est logique. Voici comment utiliser une méthode de classe pour effectuer une fonction de tri, dans des tableaux imbriqués, par exemple.
It can be useful to use a compare function in a class in PHP. But if we follow the procedural style, we will come across a type error "cannot redeclare ..." And it makes sense. Here's how to use a class method to perform a sort function, in nested arrays, for example.
/**
* @version 0.1.0
* @license GNU GPL
* @link www.sns.pm
* @author Raphaël Castello - SNS Web & Informatique
* // need to sort an array()
* Function My_Class::get_players( $ARRAY_USERS );
* Function My_Class::sort_array( $a , $b );
*/
class My_Class {
const ARRAY_USERS = array(
array( 'name' => 'Jamie', 'score' => 35, 'time_played' => 3600 ),
array( 'name' => 'Abdul', 'score' => 48, 'time_played' => 10800 ),
array( 'name' => 'Evan', 'score' => 76, 'time_played' => 14400 ),
array( 'name' => 'Carla', 'score' => 68, 'time_played' => 7200 ),
array( 'name' => 'Debora', 'score' => 54, 'time_played' => 1800 )
);
/**
* Function My_Class::sort_array( $a , $b );
* @ access public
* @ static
* @ Param. $data_type -> 'alpha' (alphabetical) / 'num' (number)
* @ Param. $order -> 'ASC' / 'DESC' - inverse order
* @ Param. $key -> 'name' , 'score, etc ..
* Sort imbricateds arrays
*/
public static function sort_array( $a , $b ){
$data_type = 'num' ; // 'alpha'
$order = 'DESC' ; // 'ASC'
$key = 'score'; // 'name'
// SORT NUMERIC VALUES
if( $data_type == 'num' && $order == 'DESC' ){
return $b[$key] - $a[$key];
}
if( $data_type == 'num' && $order == 'ASC' ){
return $a[$key] - $b[$key];
}
// SORT ALPHABETICAL VALUES
if( $data_type == 'alpha' && $order == 'ASC' ){
return $a[$key] > $b[$key];
}
if( $data_type == 'alpha' && $order == 'DESC' ) {
return $b[$key] > $a[$key];
}
}
/**
* END Function My_Class::sort_array( $a , $b );
* Sort imbricateds arrays
*/
/**
* Function My_Class::get_players( $ARRAY_USERS );
* @ access public
* @ static
* @ Param const ARRAY_USERS - must be an array returned by a data base
* @ Return : all users classed
*/
public static function get_players( $ARRAY_USERS ){
// Use usort() with a public class
usort($ARRAY_USERS, "My_Class::sort_array" );
// See output in bottom
echo json_encode( $ARRAY_USERS ,
JSON_NUMERIC_CHECK | JSON_PRETTY_PRINT );
}
/**
* END Function lists::get_players( $ARRAY_USERS );
* return all users classed
*/
}
// END class My_Class
// Launch Method
My_Class::get_players( My_Class::ARRAY_USERS );
?>
// Output :
[
{
"name": "Evan",
"score": 76,
"time_played": 14400
},
{
"name": "Carla",
"score": 68,
"time_played": 7200
},
{
"name": "Debora",
"score": 54,
"time_played": 1800
},
{
"name": "Abdul",
"score": 48,
"time_played": 10800
},
{
"name": "Jamie",
"score": 35,
"time_played": 3600
}
]