JQuery, AJAX, PHP Passing large amounts of data results in error

Question

I'm trying to pass quite a bit of data from a page using AJAX to a PHP script. This works fine for some small amounts of data, but fails with the following error when there is more data.

"PHP Warning:  Unknown: Input variables exceeded 1000. To increase the limit change max_input_vars in php.ini. in Unknown on line 0,"

The JQuery I'm using is:

var data = $flowchart.flowchart('getData');

$.ajax({
    type: "post", 
    cache: false,
    data: data,
    url: "test.php?name=" +  encodeURIComponent(name) + "&action=" + action,
    success: function(data) {
        console.log (data)
    }
});

data is effectively a json string of data.

eg:
sites: 0: {fromOperator: "SiteA", fromConnector: "output_1", fromSubConnector: "0", toOperator: "location1", toConnector: "input_1", …} 1: {fromOperator: "SiteA", fromConnector: "output_2", fromSubConnector: "0", toOperator: "location2", toConnector: "input_1", …} 2: {fromOperator: "start", fromConnector: "output_1", fromSubConnector: "0", toOperator: "SiteA", toConnector: "input_1", …}

and is read in PHP simply using:

// Values from data.
$sites = (isset($_POST['sites']) && count($_POST['sites']) > 0) ? $_POST['sites'] : NULL;
$staff = (isset($_POST['staff']) && count($_POST['staff']) > 0) ? $_POST['staff'] : NULL;

How can I pass large amounts of data link this but still reference it in PHP using $_POST['sites'] & $_POST['staff'] etc ?

I thought I'd need to do something with JSON, but I can work out what.

Thanks

Usually PHP specifies a size limit on all requests, what is the post_max_size set in you php.ini file? — Paddy
– Paddy, Commented Nov 19, 2019 at 10:18
Well, it tells you the exact problem and even the solution. You send more than 1000 fields which is the limit, to be able to work with more you need to increase it. — Rikudou_Sennin
– Rikudou_Sennin, Commented Nov 19, 2019 at 13:28

miken32 · Accepted Answer · 2019-11-20 20:47:39Z

2

I've got this working by applying JSON.stringify to data before sending it:

data = encodeURIComponent(JSON.stringify(data))

$.ajax({
    type: "post", 
    cache: false,
    data: 'data=' + data,
    url: "test.php?name=" +  encodeURIComponent(name) + "&action=" + action,
    success: function(data) {
        console.log (data)
    }
});

Then in my PHP using:

$js= json_decode($_POST['data'], true);
$staff= (isset($js['sites']) && count($js['sites']) > 0) ? $js['sites'] : NULL;
$staff= (isset($js['staff']) && count($js['staff']) > 0) ? $js['staff'] : NULL;

This seems to work as before but is allowing the larger data.

edited Nov 20, 2019 at 20:47

miken32

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answered Nov 19, 2019 at 11:46

JeffVader

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Comments

Mudasir Syed · Accepted Answer · 2019-11-19 10:19:50Z

0

add at the start after php tag hope it works.

ini_set('max_input_vars', 30000);

answered Nov 19, 2019 at 10:19

Mudasir Syed

1318 bronze badges

3 Comments

JeffVader Over a year ago

Thanks. I'd expect that to work.. but I don't know what the maximum limit I will need is. Is there a better way to send the data so I don't get this issue ?

Mudasir Syed Over a year ago

add -1 in limit i think -1 works for infinite limit

JeffVader Over a year ago

Didn't work.. max_input_vars has a changeable mode of PHP_INI_PERDIR meaning it can't be changed using ini_set

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