I have a large form that is generated from a CSV input file. Generally these files are small CSV files with 20 or 30 records, this generates a nice form without too many input fields.
However if you try to import a CSV file with thousands of records the generated form will have thousands of input fields. When you submit this form to the server not all these fields will get sent to the server.
The php configuration max_input_vars is generally set to 1000, so any fields after 1000 will be dropped, causing all sorts of issues.
The fix is to put this line of code in your .htaccess file:
php_value max_input_vars 10000
If this doesn’t work check the output of phpinfo(); The server might have suhousin or similar installed and they have their own set of variables that need to be changed (some cannot be changed in .htaccess). See here for more information:
Try this in .htaccess:
php_value suhosin.perdir pr php_value suhosin.post.max_array_depth 100 php_value suhosin.post.max_array_index_length 128 php_value suhosin.post.max_name_length 128 php_value suhosin.post.max_value_length 2000000 php_value suhosin.post.max_totalname_length 512 php_value suhosin.post.max_vars 10000 php_value suhosin.request.max_array_depth 100 php_value suhosin.request.max_array_index_length 10001 php_value suhosin.request.max_name_length 128 php_value suhosin.request.max_value_length 2000000 php_value suhosin.request.max_totalname_length 512 php_value suhosin.request.max_vars 10000