为什么PHP数据会截断POST数据？

Question

I have a pretty big form with many-many items in it. After upgrading to PHP 7, in the new environment some of the POST elements are not received by the server. The $_POST array is not empty, it contains many elements, but some of the elements from the end of the $_POST array is missing.

No error messages appear.

Increasing post_max_size in php.ini (from 8M to 128M) did not help. The data structure itself is not too big, less than 400k, so this shouldn't be the reason.

Why can this be?

Answer 1

As of PHP 5.3.9. a new php.ini setting exists called max_input_vars. It determines how many items can be used from the received data. By default it is 1000 which means that only the first 1000 items from $_POST will be used.

So, if increasing the post_max_size does not help then try to increase max_input_vars from 1000 to 5000 or whatever you need.

More info: PHP Manual for max_input_vars