Administrator's Guide

The Dom extension enables to parse XML documents. PrestaShop uses for
various functionalities, like the Store Locator. It is also used by some
modules, as well as the pear_xml_parse library.
The allow_url_fopen directive enables modules to access remote files,
which is an essential part of the payment process, among others things. It
is therefore imperative to have it set to ON.
In short, it is imperative to have the following directives set to the
indicated values:
extension = php_mysql.dll
extension = php_gd2.dll
allow_url_fopen = On
Recommended settings
Your PHP installation should feature the following settings and libraries, for
best experience:
 GZIP support.
 Mcrypt library.
 register_globals disabled.
 magic_quotes disabled.
 allow_url_include disabled
Having GZip support enables the web server to pack web pages, images
and scripts before sending them to the browser. This makes navigating
the shop faster, and therefore a more agreeable experience.
The Mcrypt provides PHP with a hardened security layer, enable the use of
more hashing and cryptography algorithm.
The register_globals directive, when enabled, defines all environment
variables (GET, POST, COOKIE, SERVER...) as global variables. It is
unsafe to use unset variables, because a user could easily set a value
into this variable by using the GET method, for example. It is therefore
imperative to set register_globals to OFF.
The magic_quotes directive automatically escapes (or "adds slashes") to all
special character sequences (', ", \, NULL) for all environment variables
(GET, POST, COOKIE, SERVER...). This option must be set to OFF because
it will addslash each variable even if it does not need to be addslashed.
Moreover, some Web applications overlook this option, so some variables
could be addslashed twice, resulting in corrupted data.