PHPUnit: assert two arrays are equal, but order of elements not important

You can use assertEqualsCanonicalizing method which was added in PHPUnit 7.5. If you compare the arrays using this method, these arrays will be sorted by PHPUnit arrays comparator itself.

Code example:

class ArraysTest extends \PHPUnit\Framework\TestCase
{
    public function testEquality()
    {
        $obj1 = $this->getObject(1);
        $obj2 = $this->getObject(2);
        $obj3 = $this->getObject(3);

        $array1 = [$obj1, $obj2, $obj3];
        $array2 = [$obj2, $obj1, $obj3];

        // Pass
        $this->assertEqualsCanonicalizing($array1, $array2);

        // Fail
        $this->assertEquals($array1, $array2);
    }

    private function getObject($value)
    {
        $result = new \stdClass();
        $result->property = $value;
        return $result;
    }
}

In older versions of PHPUnit you can use an undocumented param $canonicalize of assertEquals method. If you pass $canonicalize = true, you will get the same effect:

class ArraysTest extends PHPUnit_Framework_TestCase
{
    public function testEquality()
    {
        $obj1 = $this->getObject(1);
        $obj2 = $this->getObject(2);
        $obj3 = $this->getObject(3);

        $array1 = [$obj1, $obj2, $obj3];
        $array2 = [$obj2, $obj1, $obj3];

        // Pass
        $this->assertEquals($array1, $array2, "\$canonicalize = true", 0.0, 10, true);

        // Fail
        $this->assertEquals($array1, $array2, "Default behaviour");
    }

    private function getObject($value)
    {
        $result = new stdclass();
        $result->property = $value;
        return $result;
    }
}

Arrays comparator source code at latest version of PHPUnit: https://github.com/sebastianbergmann/comparator/blob/master/src/ArrayComparator.php#L46

The cleanest way to do this would be to extend phpunit with a new assertion method. But here's an idea for a simpler way for now. Untested code, please verify:

Somewhere in your app:

 /**
 * Determine if two associative arrays are similar
 *
 * Both arrays must have the same indexes with identical values
 * without respect to key ordering 
 * 
 * @param array $a
 * @param array $b
 * @return bool
 */
function arrays_are_similar($a, $b) {
  // if the indexes don't match, return immediately
  if (count(array_diff_assoc($a, $b))) {
    return false;
  }
  // we know that the indexes, but maybe not values, match.
  // compare the values between the two arrays
  foreach($a as $k => $v) {
    if ($v !== $b[$k]) {
      return false;
    }
  }
  // we have identical indexes, and no unequal values
  return true;
}

In your test:

$this->assertTrue(arrays_are_similar($foo, $bar));