Problems transferring data between PHP pages using POST
I am having a problem passing values between pages in PHP using POST. I am using a hidden field at the bottom of the page to indicate the number of items (student rows) I have on the page. I also have a filter option that reduces the number of items visible on the page. When I submit data from a filtered page, all values (including hidden ones) are not subject to any fear. When I submit data with an unfiltered page, the hidden values are not getting through (and hence my data collection is not happening).
In clincher, this does not happen in an Apache based test environment, it only happens when I go to an IIS based production environment.
Here is a screenshot of the original page (actual data has been removed for privacy reasons) showing the inputs. There are 12 rows of 30 entrances each (360 in total):
Here is the HTML code with hidden fields that I need:
<input type="hidden" value="12" name="numStudents">
<input type="hidden" value="10" name="numTasks">
<input type="hidden" value="3" name="numCriteria">
<input class="btn btn-primary btn-large" type="submit" value="Save" name="submit">
Here's the PHP code that gets the values:
//Get the general information from the form
$numStudents = $common->clean($_POST["numStudents"], $CON);
$numTasks = $common->clean($_POST["numTasks"], $CON);
$numCriteria = $common->clean($_POST["numCriteria"], $CON);
//Loop to get grades for all students
$output = "";
$flagChange = FALSE;
$count = 0;
for($i = 0; $i < $numStudents; $i++)
When I go out of the value of both $ numStudents and $ _POST ["numStudents"], nothing appears.
A really confusing thing - when I have a list of 1 or 2 students, the unfiltered data goes through without problem (echo displays the correct value). As mentioned earlier, if I filter the data so that only 6 columns of input are shown for each student, the data comes in without issue.
Does IIS have a maximum number of valid values in the POST variable? If so, can this be changed? I checked the PHP.ini file and the max message size is set to 8M (which this data doesn't fit).
Is there any other setting that I need to change?
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So, I was able to re-break my search term to find a solution to this. It turns out that in PHP there is a parameter for the maximum number of elements allowed in a POST array. My limit was set to the default 1000, now I have increased it to 3000.
Parameter in PHP.ini file: max_input_vars
I found this page helped to solve this problem:
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The maximum size of POST data that can be sent depends on each server. For PHP / APACHE it can be set from .htaccess as:
#set max post size
php_value post_max_size 20M
In IIS, you want to change maxAllowedContentLength
See: http://www.iis.net/configreference/system.webserver/security/requestfiltering/requestlimits
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