php json_decode not working for large string

Question

can anyone please help me to sort out json_decode issue , here is my json string which is working fine -

{"323":"723","317":"704","316": {"date":"28\/12\/2016"},"314":"701","315": {"area":"sdfgdfg"}}

but if I add one more key value pair then json_decode function does not work.

{"336":"761","323":"723","317":"704","316": {"date":"28\/12\/2016"},"314":"701","315": {"area":"test"}}

2nd string is not working , however at my local system both strings are working fine , what are the php config parameters I need to check ? I have increase memory limit , max execution time and max post size what else I need to check , please help.

updated here are my codes -

$arrProducts = array(
        array(
            "product_id" => $_REQUEST['product_id'],
            "qty" => $_REQUEST['quantity'],
            "options" => json_decode($_REQUEST['product_options'], true),
            "sku" => $_REQUEST['sku'],
            "store_id" => 1
        )
    );
print_r($arrProducts);

it prints blank array for the 2nd string.

I have checked error log , it shows - PHP Warning: Unknown: POST Content-Length of 274 bytes exceeds the limit of 256 bytes in Unknown on line 0

could you please provide the code in question, too? i'm guessing it has nothing to do with json_decode itself. — Franz Gleichmann
– Franz Gleichmann, Commented Dec 21, 2016 at 8:25
Your second string decodes without any problems: eval.in/701965 — jeroen
– jeroen, Commented Dec 21, 2016 at 8:26
Unable to replicate any issues - json_decode on the above string works fine. — Professor Abronsius
– Professor Abronsius, Commented Dec 21, 2016 at 8:27
if that's not working only in your live server then try checking your apache error log in your live — Beginner
– Beginner, Commented Dec 21, 2016 at 9:00

Sarath Sadasivan Pillai · Accepted Answer · 2016-12-21 10:18:50Z

1

Here the question is misleading, the issue that you are facing is not that json_decode fails to decode rather the POST maximum size is exceeding

You may find something like the following in your php.ini file

; Maximum size of POST data that PHP will accept.
; Its value may be 0 to disable the limit. It is ignored if POST data reading
; is disabled through enable_post_data_reading.
; http://php.net/post-max-size
post_max_size = 256

Change the above to

post_max_size = 8M

ie, 8M as post size limit

And if you are using apache you may need to change .htaccess aswell. Here is the reference for #post_max_size

edited Dec 21, 2016 at 10:18

answered Dec 21, 2016 at 9:30

Sarath Sadasivan Pillai

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1 Comment

Sachin Vairagi Over a year ago

actually I was not able to debug it , thank you , it is working now.

manojmo · Accepted Answer · 2025-09-08 09:52:40Z

-2

There can be another reason for the POST data being empty : sys_temp_dir

Check your php logs for errors like :
PHP Warning: PHP Request Startup: Unable to create temporary file, Check permissions in temporary files directory.
PHP Warning: PHP Request Startup: POST data can't be buffered; all data discarded

It seems that for requests with large amounts of data, PHP will store them as temp files in the temp dir.

This dir is defined an init-param : sys_temp_dir

If its set incorrectly, or is not writable, temp files cannot be created and the large request data is discarded.

Also, enabling php-fpm could cause this issue, as per my webhosting provider

edited Sep 8 at 9:52

answered Sep 7 at 13:13

manojmo

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2 Comments

Nico Haase Sep 8 at 12:52

What makes you think that this setting is related, and that this influences how different string lengths are consumed?

mickmackusa Sep 9 at 4:45

It is never appropriate to post duplicate answers on multiple pages. If the questions can be resolved with identical answers, then perhaps you should be voting/flagging to close one of the questions as a duplicate of the other. If the questions are significantly different, then your answers should also be significantly different. Please take a moment to decide if/how you wish to edit/delete one or more of your answers. We would rather you curate your content so that the community doesn't need to intervene.

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