How to limit the size of uploaded files in php

Sometimes you need to use php to upload relatively large files. This is not possible by default and must be modified according to the following method.

Configure the php.ini file (taking uploading files below 500M in size as an example)
Find the following options and modify them ->
file_uploads = On ;OpenFile uploadOption
upload_max_filesize = 500M;Upload file upper limit

If you want to upload a relatively large file, the above two are not enough, you must add the serverCache Increase the upper limit and lengthen the maximum execution time of the script
post_max_size = 500M; post upper limit
max_execution_time = 1800; Maximum execution time of each script, in seconds Maximum execution time of script Time
max_input_time = 1800; Maximum amount of time each script may spend parsing request data
memory_limit = 128M; Maximum amount of memory a script may consume (128MB)Memory upper limit

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