collapse.php

<?php

/**
 * Collapse an array of arrays into a single array.
 *
 * @param  array  $array
 * @return array
 */
public static function collapse($array)
{
    $results = [];

    foreach ($array as $values) {
        if ($values instanceof Collection) {
            $values = $values->all();
        } elseif (! is_array($values)) {
            continue;
        }

        $results = array_merge($results, $values);
    }

    return $results;
}