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Ingo Schommer 1efa22f9bb Reinstate 7.0 support, clarify policy

We’ve discussed dropping support for 5.6 once it’s EOL on https://github.com/silverstripe/silverstripe-framework/issues/6705.
The same question needs to be asked for 7.0, which goes EOL in the same month. And should be generalised to future PHP versions.
Follow up to https://github.com/silverstripe/silverstripe-framework/pull/6718/

2017-03-21 08:28:08 +13:00

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Requirements

SilverStripe CMS needs to be installed on a web server. Content authors and website administrators use their web browser to access a web-based GUI to do their day-to-day work. Website designers and developers require access to the files on the server to update templates, website logic, and perform upgrades or maintenance.

Our web-based PHP installer can check if you meet the requirements listed below.

Web server software requirements

PHP 5.6 and PHP 7.x
Once PHP versions become unsupported by the PHP Project), we drop support for those versions in the next minor release
We recommend using a PHP accelerator or opcode cache, such as xcache or WinCache.
Allocate at least 48MB of memory to each PHP process. (SilverStripe can be resource hungry for some intensive operations.)
Required modules: dom, gd2, fileinfo, hash, iconv, mbstring, mysqli (or other database driver), session, simplexml, tokenizer, xml.

Recommended configuration

 safe_mode = Off
 magic_quotes_gpc = Off
 memory_limit = 48M

See phpinfo() for more information about your environment
One of the following databases:
MySQL 5.0+
PostgreSQL 8.3+ (requires "postgresql" module)
SQL Server 2008+ (requires "mssql" module)
Support for Oracle and SQLite is not commercially supported, but is under development by our open source community.
One of the following web server products:
Apache 2.0+ with mod_rewrite and "AllowOverride All" set
IIS 7+
Support for Lighttpd, IIS 6, and other web servers may work if you are familiar with configuring those products.
We recommend enabling content compression (for example with mod_deflate) to speed up the delivery of HTML, CSS, and JavaScript.
One of the following operating systems:
Linux/Unix/BSD
Microsoft Windows XP SP3, Vista, Windows 7, Server 2008, Server 2008 R2
Mac OS X 10.4+

Web server hardware requirements

Hardware requirements vary widely depending on the traffic to your website, the complexity of its logic (i.e., PHP), and its size (i.e., database.) By default, all pages are dynamic, and thus access both the database and execute PHP code to generate. SilverStripe can cache full pages and segments of templates to dramatically increase performance.

A typical website page on a conservative single CPU machine (e.g., Intel 2Ghz) takes roughly 300ms to generate. This comfortably allows over a million page views per month. Caching and other optimisations can improve this by a factor of ten or even one hundred times. SilverStripe CMS can be used in multiple-server architectures to improve scalability and redundancy.

For more information on how to scale SilverStripe see the Performance Guide.

Client side (CMS) requirements

SilverStripe CMS is designed to work well with Google Chrome, Mozilla Firefox and Internet Explorer 10+. We aim to provide satisfactory experiences in Apple Safari. SilverStripe CMS works well across Windows, Linux, and Mac operating systems.

End user requirements

SilverStripe CMS is designed to make excellent, standards-compliant websites that are compatible with a wide range of industry standard browsers and operating systems. A competent developer is able to produce websites that meet W3C guidelines for HTML, CSS, JavaScript, and accessibility, in addition to meeting specific guide lines, such as e-government requirements.

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