# Problem on add Attachments (PHP Project)
**URL:** https://discuss.tryton.org/t/problem-on-add-attachments-php-project/866
**Category:** Developer
**Created:** [November 9, 2018, 2:34pm UTC](https://discuss.tryton.org/t/problem-on-add-attachments-php-project/866 "2018-11-09T14:34:18Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Vincenzo](https://discuss.tryton.org/u/Vincenzo)
#### Post date: [November 9, 2018, 2:34pm UTC](https://discuss.tryton.org/t/problem-on-add-attachments-php-project/866/1 "2018-11-09T14:34:18Z")
Good afternoon,
I’m continuing with my PHP project with JSON-RPC calls to the Tryton server.
I have a problem: I can not insert attachments.
I’m using the model.ir.attachment.create method.
Which format should I convert the file to?
What does the bytearray method do?
Thank you
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### Author:  [@albert](https://discuss.tryton.org/u/albert)
#### Post date: [November 9, 2018, 3:25pm UTC](https://discuss.tryton.org/t/problem-on-add-attachments-php-project/866/2 "2018-11-09T15:25:18Z")
I guess you should use base64 for the binary content
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [November 9, 2018, 3:30pm UTC](https://discuss.tryton.org/t/problem-on-add-attachments-php-project/866/3 "2018-11-09T15:30:15Z")
Indeed the JSON format for binary value is an object like `{' __class__': 'bytes', 'base64': value} ` where value is the content encoded in base64.
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### Author:  [@Vincenzo](https://discuss.tryton.org/u/Vincenzo)
#### Post date: [November 12, 2018, 10:20am UTC](https://discuss.tryton.org/t/problem-on-add-attachments-php-project/866/4 "2018-11-12T10:20:57Z")
I can not make it work…
Analyzing the data exchanged by the client in verbose mode I send this:
`INFO:tryton.rpc:model.ir.attachment.create([{u'data': bytearray(b'VALUE'), u'resource': 'stock.shipment.out.return,1', u'name': u'FB_IMG_1503910564025.jpg', u'type': u'data'}], PREF)`
I should enter
`{' __class__': 'bytes', 'base64': value}`
instead of
`bytearray(b'VALUE')`?
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### Author:  [@ced](https://discuss.tryton.org/u/ced)
#### Post date: [November 12, 2018, 10:51am UTC](https://discuss.tryton.org/t/problem-on-add-attachments-php-project/866/5 "2018-11-12T10:51:55Z")
> [@Vincenzo](#):
>
> I should enter
>
> `{' __class__': 'bytes', 'base64': value}`
>
> instead of
>
> `bytearray(b'VALUE')` ?
Yes bytearray is the Python object which does not exist in PHP.
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### Author:  [@system](https://discuss.tryton.org/u/system)
#### Post date: [December 12, 2018, 10:52am UTC](https://discuss.tryton.org/t/problem-on-add-attachments-php-project/866/6 "2018-12-12T10:52:05Z")
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