Solved

processing very big json file with php  - json_decode()

Posted on 2014-12-29
7
715 Views
Last Modified: 2015-01-06
I'm getting a memory exhausted error on json_decode(), how to resolve this ?
0
Comment
Question by:sniger
7 Comments
 
LVL 1

Accepted Solution

by:
Christian Vivas earned 500 total points
ID: 40522863
have you tried with memory_limit? upgrade the memory_max_limit in your php.ini to more than 128 lets say 512
0
 

Author Comment

by:sniger
ID: 40522869
other solutions ?
0
 
LVL 58

Expert Comment

by:Gary
ID: 40522945
You've got the solution above - increase PHP's memory
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 108

Expert Comment

by:Ray Paseur
ID: 40522966
Please post a URL that gives us a link to the JSON string.   Then we can experiment with it and try to offer some assistance.  It may be as simple as increasing the memory limit, but it's probably going to require a surprisingly large limit.  PHP arrays and objects can run 20X the size of their string equivalents.  So if the JSON string is 4MB, you may be looking at 80MB just to hold the object of the decoded string.  Add to that any arrays or objects that are extracted in the course of processing the JSON object and you can see how this can domino into a huge memory requirement.

FWIW, JSON is a more economical transport mechanism than XML, and has mostly replaced XML in modern applications.

Once we can see the JSON string, if there is anything that can be done with memory limit, we can show you the requirement.  And if there is not any way to get an adequate memory limit, we may be able to suggest some workarounds.
0
 

Author Comment

by:sniger
ID: 40522968
what if 512 or 1024 is still too small ? How can I know the maximum size of a file which I'm going to get from external sources ?
0
 

Author Comment

by:sniger
ID: 40522970
Ray,

It is some simple key: value, array:
[
 {key1: val1, key2:val3, key3:val3,........},
  {key1: val1a, key2:val3a, key3:val3a,........},
  {key1: val1b, key2:val3b, key3:val3b,........}
.................................................,
]
0
 
LVL 108

Expert Comment

by:Ray Paseur
ID: 40523000
Hi, @sniger.  The key to this issue is the size of the JSON string, the number of nodes, etc.  That's why we need to see the test data set -- one that replicates the likely size of the real JSON strings.  We can't really answer the "what if" questions without seeing some test data.  It's rare that a JSON string is too large for processing with PHP, and since we're dealing with a rare thing here, there may not be a lot of preexisting solutions.
How can I know the maximum size of a file...
In a nutshell, you can't but with some test data we may be able to give you some useful strategies (I hope).
http://sscce.org/
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
mimic google as my ip 11 53
php ssh2_scp_send 1 46
Hacked File Timestamps 4 47
mysql update statement effect only some rows 4 26
Build an array called $myWeek which will hold the array elements Today, Yesterday and then builds up the rest of the week by the name of the day going back 1 week.   (CODE) (CODE) Then you just need to pass your date to the function. If i…
This article discusses four methods for overlaying images in a container on a web page
The viewer will learn how to dynamically set the form action using jQuery.
The viewer will learn how to count occurrences of each item in an array.

930 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

16 Experts available now in Live!

Get 1:1 Help Now