(PHP) Sort array of objects by property value

usort($myArray, function($a, $b)
{
    return strcmp($a->myPropery, $b->myPropery);
});

Sort by predefined order:

$predefinedOrder = array(1,5,2,6);

usort($arrayOfObjects, function ($a, $b) use ($predefinedOrder ) {

    $flipped = array_flip($predefinedOrder);
    $left = $flipped[$a->myPropery)];
    $right = $flipped[$b->myPropery)];
    return $left >= $right;
});