Error converting Json string to array of objects PHP

Question

I made a post in a form converting my javascript localstorage to a post request. From there I tried to decode my json string to make an object in PHP.

How my php code looks before I echo it

    $cart_items = $_POST['cart_items'];
    $cart_items = json_encode($cart_items);
    $array_test = json_decode($cart_items);
    print_r($array_test);

What it returns in browser

[{\"id\":83494890,\"title\":\"2020 Hino 358\",\"partType\":\"Bumpers\",\"price\":100,\"stockNumber\":12313131312,\"thumbImg\":\"/jOIY91KhEby8_f.jpg\",\"permalink\":\"/part-description/?part=83494890\",\"maxQuantity\":1,\"requestedQuantity\":\"3\"}
,{\"id\":83493833,\"title\":\"2009 Freightliner 5020080\",\"partType\":\"ABS Modulator Valves\",\"price\":150,\"stockNumber\":\"P-1211111111157\",\"thumbImg\":\"/OOjQbsi6p8kX_f.jpg\",\"permalink\":\"/part-description/?part=83493833\",\"maxQuantity\":1,\"requestedQuantity\":\"1\"}]

I know that typically when seeing json data there isn't forward slashes everywhere. I tried to json_decode into an array rather than an object, then make a foreach for each object inside. But I got this error returned "Invalid argument supplied for foreach()"

How do I make this json string convert to an array of objects? Thank you

Could you var_dump($_POST); before that and share here what would be coming in on POST? — IncredibleHat
– IncredibleHat, Commented Aug 31, 2020 at 16:53

davidb3rn · Accepted Answer · 2020-08-31 17:39:57Z

1

The problem I was having was when I was getting the $_POST[] it was using PHP's "magic quotes" which was giving me improper format for my json. That being said, after disabling this, it removes the slashes.

answered Aug 31, 2020 at 17:39

davidb3rn

1713 silver badges16 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Barmar Over a year ago

Magic quotes has been obsolete for years. You must be using a very old PHP version.

Barmar · Accepted Answer · 2020-08-31 16:50:29Z

0

It looks like $_POST['cart_items'] already contains JSON. So you just need to decode it, not encode it first.

$array_test = json_decode($_POST['cart_items'], true);
print_r($array_test);

But it's actually encoded twice, that's why it has escaped quotes, so you need to call json_decode() twice. But it's missing the double quotes around the whole thing, and the embedded newline is not valid.

The following works:

<?php
  $cart_items = '"[{\"id\":83494890,\"title\":\"2020 Hino 358\",\"partType\":\"Bumpers\",\"price\":100,\"stockNumber\":12313131312,\"thumbImg\":\"/jOIY91KhEby8_f.jpg\",\"permalink\":\"/part-description/?part=83494890\",\"maxQuantity\":1,\"requestedQuantity\":\"3\"},{\"id\":83493833,\"title\":\"2009 Freightliner 5020080\",\"partType\":\"ABS Modulator Valves\",\"price\":150,\"stockNumber\":\"P-1211111111157\",\"thumbImg\":\"/OOjQbsi6p8kX_f.jpg\",\"permalink\":\"/part-description/?part=83493833\",\"maxQuantity\":1,\"requestedQuantity\":\"1\"}]"';
  $array_test = json_decode(json_decode($cart_items));
  print_r($array_test);

I suggest you find the code that's sending the cart_item POST parameter and fix it so it doesn't do all this extra encoding.

edited Aug 31, 2020 at 16:50

answered Aug 31, 2020 at 16:34

Barmar

789k57 gold badges554 silver badges669 bronze badges

6 Comments

davidb3rn Over a year ago

So I did try this at first, but nothing gets printed without the json_encode. However when I print the string without the decode it still has the slashes and looks very similar.

Barmar Over a year ago

it's not valid JSON. There needs to be " around it, and it can't have a newline in it.

Barmar Over a year ago

@IncredibleHat If it were an array of JSON, it would look like ["{\"id\":83494890,...]

davidb3rn Over a year ago

Thank you! This worked great. I just needed to get the post type, add quotes around it then do a double json_decode. I don't understand what happened. I know this isn't the best code on my part. I think posting the input reformatted it. Thank you for heading me in the right direction!

IncredibleHat Over a year ago

@Barmar hmm. Yeah, something aint right with the incoming data. Hopefully OP can figure that out now that they got a better handle on it :D

|

Collectives™ on Stack Overflow

Error converting Json string to array of objects PHP

2 Answers 2

1 Comment

6 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

6 Comments

Your Answer

Sign up or log in

Post as a guest

Related