Sort array of objects by one or more properties of the object.

osort.php

<?php

/**
 * Sort an array of objects.
 * 
 * Requires PHP 5.3+ to be installed.
 *
 * Will use the Intl extension to normalize characters if it's
 * available.
 *
 * You can pass in one or more properties on which to sort.  If a
 * string is supplied as the sole property, or if you specify a
 * property without a sort order then the sorting will be ascending.
 *
 * If the key of an array is an array, then it will sorted down to that
 * level of node.
 *
 * Example usages:
 *
 * osort($items, 'size');
 * osort($items, ['size', ['time' => SORT_DESC, 'user' => SORT_ASC]]);
 * osort($items, ['size', ['user', 'forname']])
 *
 * @param array $array
 * @param string|array $properties
 */
function osort(&$array, $properties)
{
    if (is_string($properties)) {
        $properties = array($properties => SORT_ASC);
    }
    uasort($array, function($a, $b) use ($properties) {
        foreach($properties as $k => $v) {
            if (is_int($k)) {
                $k = $v;
                $v = SORT_ASC;
            }
            $collapse = function($node, $props) {
                if (is_array($props)) {
                    foreach ($props as $prop) {
                        $node = (!isset($node->$prop)) ? null : $node->$prop;
                    }
                    return $node;
                } else {
                    return (!isset($node->$props)) ? null : $node->$props;
                }
            };
            if (class_exists('\Normalizer')) {
                $aProp = \Normalizer::normalize($collapse($a, $k), \Normalizer::FORM_D);
                $bProp = \Normalizer::normalize($collapse($b, $k), \Normalizer::FORM_D);
            } else {
                $aProp = $collapse($a, $k);
                $bProp = $collapse($b, $k);
            }
            if ($aProp != $bProp) {
                return ($v == SORT_ASC)
                    ? strnatcasecmp($aProp, $bProp)
                    : strnatcasecmp($bProp, $aProp);
            }
        }
        return 0;
    });
}

@rodmar35 👍 Thanks for the feedback - corrected now!