Symfony 2. usort() 不起作用

Question

伙计们！我需要帮助。 Usort() 在 symfony2 class.

中不起作用

class UserController extends Controller
{   ...
 /**
 * @Route("/dashboard", name="dashboard")
 */

public function dashboard()
{

SQL 查询：

    /** @var \MyBundle\Entity\User $user */
    $user = $this->getDoctrine()
        ->getRepository('MyBundle:User')
        ->find($this->getUser()->getId());
    /** @var \MyBundle\Entity\Event[] $events */
    $events = $this->getDoctrine()
        ->getRepository('MyBundle:Event')
        ->findBy(['creator' => $user->getId()]);

数据数组：

$allEvents = [];        
    foreach ($events as $event) {
        $allEvents[] = $event;
    }
    foreach ($user->getEvents() as $event) {
        $allEvents[] = $event;
    }

树枝的结果：

    return $this->render(
        'MyBundle:User:dashboard.html.twig',
        [ 'allEvents' => usort($allEvents, function( $a, $b )
            { if ( $a["schedule"] == $b["schedule"] )
                { return 0; }
                else
                { return ( $a["schedule"] < $b["schedule"] ) ? -1 : 1; }
            }),

代码续...

怎么了？

Answer 1

正如@Rizier123 所说，usort() returns a boolean.

所以试试这个：

// First, sort the array
usort($allEvents, function($a, $b) { // $a and $b are instances of MyBundle\Entity\Event
    // this depends on your object, just call the right function
    if ($a->getSchedule() == $b->getSchedule()) {
        return 0;
    }

    return $a->getSchedule() < $b->getSchedule() ? -1 : 1;
});

// Then, use the sorted array in your template
return $this->render('MyBundle:User:dashboard.html.twig', [
    'allEvents' => $allEvents,
]);

Symfony 2. usort() 不起作用

Symfony 2. Doesn't work usort()

php

usort

symfony