Sort an array of objects based on a specific property

Question

How can I sort this array of objects by a field such as name or count?

Array
(
    [0] => stdClass Object
        (
            [ID] => 1
            [name] => Mary Jane
            [count] => 420
        )

    [1] => stdClass Object
        (
            [ID] => 2
            [name] => Johnny
            [count] => 234
        )

    [2] => stdClass Object
        (
            [ID] => 3
            [name] => Kathy
            [count] => 4354
        )

   ....

Answer 1

This is a better way to use closures

usort($your_data, function($a, $b)
{
    return strcmp($a->name, $b->name);
});

Please note that this is not in the PHP documentation, but if you are using version 5.3, closures are supported and callable parameters can be provided.

Answer 2

Using usort, here is an example adapted from the manual:

function cmp($a, $b) {
    return strcmp($a->name, $b->name);
}

usort($your_data, "cmp");

You can also use any callable as the second parameter. Here are some examples:

• Using Anonymous functions (starting with PHP 5.3)

  usort($your_data, function($a, $b) {return strcmp($a->name, $b->name);});

• Used inside the class

  usort($your_data, array($this, "cmp")); // "cmp"应该是类中的一个方法

• Using arrow functions (starting with PHP 7.4)

  usort($your_data, fn($a, $b) => strcmp($a->name, $b->name));

Also, if you want to compare values, fn($a, $b) => $a->count - $b->countas a "comparison" function should do the trick , or, if you want to do the same thing another way, starting with PHP 7 you can use the spaceship operator, like this: fn($a, $b) => ; $a->count <=> $b->count.