Sorting an array of SimpleXML objects

Question

I\'ve read what I\'ve found on Stackoverflow and am still unclear on this.

I have an array of SimpleXML objects something like this:

array(2) {
  [0]         


        

Answer 1

Here's another example of using usort(). This one allows you to specify the object variable and the sort direction:

function sort_obj_arr(& $arr, $sort_field, $sort_direction)
{
    $sort_func = function($obj_1, $obj_2) use ($sort_field, $sort_direction)
    {
        if ($sort_direction == SORT_ASC) {
            return strnatcasecmp($obj_1->$sort_field, $obj_2->$sort_field);
        } else {
            return strnatcasecmp($obj_2->$sort_field, $obj_1->$sort_field);
        }
    };
    usort($arr, $sort_func);
}

Test code;

class TestClass
{
    public $name;
    public $age;

    public function __construct($name, $age)
    {
        $this->name = $name;
        $this->age  = $age;
    }
}

$test[] = new TestClass('Tom', 28);
$test[] = new TestClass('Mary', 48);
$test[] = new TestClass('Beth', 38);
$test[] = new TestClass('Cindy', 18);
$test[] = new TestClass('Sid', 58);
$test[] = new TestClass('Mandy', 8);

$field = 'age';
$direction = SORT_DESC;
sort_obj_arr($test, $field, $direction);

echo '
';
print_r($test);
echo '
';