<?php

/**

* Function to be tested

*

* Includes a number of features that require PHP 7.0+, including:

* - Scalar type hints

* - Return types

* - The "spaceship" operator

*

*/

function sortArrayOfObjects(string $field, array $objects): array

{

usort($objects, function ($a, $b) use ($field) {

return $a->{$field} <=> $b->{$field};

});

return $objects;

}

/**

* PHPUnit test code

*

* Normally this would be in another file, but we're keeping it simple.

* This test simply verifies that the sorting works, but will throw

* a syntax error in PHP < 7.0.

*/

use PHPUnit\Framework\TestCase;

class SortArrayOfObjectsTest extends TestCase

{

function testItSortsWhenFieldExists()

{

$objects = [

(object) [

'sort_order' => '2',

'name' => 'The first shall be last',

],

(object) [

'sort_order' => '1',

'name' => 'The last shall be first',

],

];

$result = sortArrayOfObjects('sort_order', $objects);

$this->assertEquals($objects[0], $result[1]);

$this->assertEquals($objects[1], $result[0]);

}

}