Do I need to change or adjust MAX EXECUTION TIME, MEMORY LIMIT, MAX FILE SIZE for this script?
MAX EXECUTION TIME: is number of seconds a script is allowed to run.
MEMORY LIMIT: is the maximum amount of memory in bytes that a script is allowed to use.
UPLOAD MAX FILE SIZE: is maximum size of an uploaded file.
Post Max Size: is Max size of post data allowed.
You do not need to change these usually. Default server settings are best for these. In rare cases if you want to allow your customers / users to send you large size files, or you want to set a lower limit for security reasons or to save bandwidth – then you can adjust these from PHP script, php.ini file or by using .htaccess file.
We have explained in the documentation how you can adjust these values to best suit your needs.