|  support |  documentation |  report a bug |  advanced search |  search howto |  statistics |  random bug |  login
Request #72238 Make Generator class serialisable in JSON
Submitted: 2016-05-18 19:59 UTC Modified: 2016-09-16 19:20 UTC
Avg. Score:5.0 ± 0.0
Reproduced:3 of 3 (100.0%)
Same Version:2 (66.7%)
Same OS:2 (66.7%)
From: gregory at luni dot fr Assigned:
Status: Open Package: JSON related
PHP Version: 7.0.6 OS: All
Private report: No CVE-ID: None
View Add Comment Developer Edit
Welcome! If you don't have a Git account, you can't do anything here.
You can add a comment by following this link or if you reported this bug, you can edit this bug over here.
Block user comment
Status: Assign to:
Bug Type:
From: gregory at luni dot fr
New email:
PHP Version: OS:


 [2016-05-18 19:59 UTC] gregory at luni dot fr
json_encode() function does not accept Generator objects.

This is I think a interesting optimization in the source code in userland, as it wouldn't be necessary anymore to transform what is yielded by the generator into a temporary array.

From the userland point of view, it could be done via JsonSerializable interface implementation.

Test script:

// Example 1 : minimal POC

$callback = function(){
    yield ['a', 'b', 'c', 'd'];
    yield ['e', 'f', 'g', 'h'];
    yield ['i', 'j', 'k', 'l'];
    yield ['m', 'n', 'o', 'p'];

echo json_encode($callback(), JSON_PRETTY_PRINT) . PHP_EOL;

// Example 2 : real-life example

class Item
    public $label;
    public function __consctruct($label)
        $this->label = $label;

class Collection
    private $items = [];
    public function add(Item $item)
        $this->items[] = $item;

    public function walkItemLabels()
        foreach ($this->items as $item) {
            yield $item->label;

$collection = new Collection();
$collection->add(new Item('Lorem'));
$collection->add(new Item('Ipsum'));
$collection->add(new Item('Dolor'));
$collection->add(new Item('Sit'));
$collection->add(new Item('Amet'));

echo json_encode($collection->walkItemLabels(), JSON_PRETTY_PRINT) . PHP_EOL;

Expected result:
// Example 1

[['a', 'b', 'c', 'd'],['e', 'f', 'g', 'h'],['i', 'j', 'k', 'l'],['m', 'n', 'o', 'p']]

// Example 2


Actual result:
// Example 1


// Example 2



Add a Patch

Pull Requests

Add a Pull Request


AllCommentsChangesGit/SVN commitsRelated reports
 [2016-09-16 19:20 UTC]
-Package: json +Package: JSON related
PHP Copyright © 2001-2024 The PHP Group
All rights reserved.
Last updated: Sun Apr 14 09:01:29 2024 UTC