json_encode() returns null since array has huge number of records

Question

I have used json_encode($response) to list the all the files in the directory. Since it has nearly 8000 records in the array of $response, when displayed in the page, it returns null.

I have research about this issue. So far, I could not find any solution.

This is my code:

$response['content'] = Files::$output;
echo json_encode($response);
Files::$output` /* this will return the list of files in the html format. */

When I try echo json_last_error_msg();, it returns:

Malformed UTF-8 characters, possibly incorrectly encoded

How are you displaying it on the page, can you post your code? — JammuPapa
– JammuPapa, Commented Jun 12, 2015 at 7:05
have you try to change the memory_limit parameter in php.ini ? — mmm
– mmm, Commented Jun 12, 2015 at 7:08
How exactly have you concluded that the issue is the size of the input and not something else? Have you checked json_last_error_msg? — deceze
– deceze ♦, Commented Jun 12, 2015 at 7:12
So your problem turns out to be a duplicate of stackoverflow.com/questions/14868096/… — deceze
– deceze ♦, Commented Jun 12, 2015 at 8:28

Amelia · Accepted Answer · 2015-06-15 15:30:14Z

0

JSON can only accept valid UTF characters when encoding them via json_encode.

Odds are, you have malformed input (as your error message says), which is more than likely some variant of a windows code page.

To ensure that your array is free of invalid JSON data, you can either convert it at a database layer (assuming you are using a database), or do the following (this assumes you have malformed latin1/ISO-8859-1 as the cause of your bad data):

foreach ($row as $key => &$value) {
    if ( ! mb_check_encoding($value, "UTF-8")) {
        // assume base is latin1; your mileage may vary
        $value = mb_convert_encoding($value, "UTF-8", "ISO-8859-1");
    }
}

You can't really force json_encode to parse your invalid data, so you're going to have to massage your dataset into valid UTF-8.

answered Jun 15, 2015 at 15:30

Amelia

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