PHP large form uses post method to transmit data packet loss problem

In the production environment, a huge form includes three pictures, hundreds of input boxes, and nearly a thousand checkboxes. When submitted to the background using the post method, the data is cut off.

In the production environment, a huge form includes three pictures, hundreds of input boxes, and nearly a thousand checkboxes. When submitted to the background using the post method, the data is truncated. After debugging all the way, I found that when PHP got $_POST, the data was insufficient. At first I thought it was a problem with post_max_size and upload_max_size in PHP, but setting it to 100M didn't work either. Later, I thought it was a problem with limitpostdate in Apache, and it didn't work even if I set it too high. Later, I installed wireShark on the client to capture packets, and found that TCP WINDOWS FULL appeared in the middle of the tcp packet, so I thought it was because the browser did not correctly transmit the total package size during the second TCP handshake. Until the end, I found the following error in Apache’s error.log: PHP Warning: Unknown: Input variables exceeded 1000 It turns out that the default number of parameters in a post in PHP is 1000, and the excess will be automatically thrown away.

Adjust this value, for example, we set it to 2000: Set in PHP.ini max_input_vars = 2000