PrestaShop server requirements and PHP configurations

This article explains the server requirements and recommended PHP configurations for the better functioning of PrestaShop.

PrestaShop requires the following server configurations:

System: Unix, Linux or Windows. 
Web server: Apache Web Server 2.2 or any later version.
PHP: We recommend PHP 7.1 or later
MySQL: 5.0 minimum, 5.6 or later recommended. 
Server RAM: The more the better. We recommend setting the memory allocation per script (memory_limit) to a minimum of 256M.

PrestaShop requires the following PHP Extensions:

CURL. The Client URL extension is used to download remote resources like modules and localization packages.
DOM. The DOM extension is needed to parse XML documents. PrestaShop uses it for various functionalities, like the Store Locator. It is also used by some modules, as well as the pear_xml_parse library.
Fileinfo. The File information extension is used to find out the file type of uploaded files.
GD. The GD extension is used to create thumbnails for the images that you upload.
Intl. The Internationalization extension is used to display localized data, such as amounts in different currencies.
Zip. The Zip extension is used to expand compressed files such as modules and localization packages.

PrestaShop requires the following PHP configurations:

register_globals = off
display_errors = Off
magic_quotes_gpc = Off
error_reporting "E_ALL & ~E_NOTICE"
memory_limit = 256M
max_execution_time = 300;
max_input_time = -1
max_input_vars = 30000
upload_max_filesize = 50M;
post_max_size = 50M;
allow_url_fopen = On
allow_url_include = Off
short_open_tag = On
realpath_cache_size = 5M
always_populate_raw_post_data = -1
safe_mode = Off
expose_php = Off
output_buffering = 4096

Please note that these are the basic recommendation only. More tweaks might be required depending on the environments and traffic.

That's all…