System Requirements

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PHP

Concrete CMS is written primarily in PHP. Additionally, some PHP extensions which provide extra functionality are needed. The version of the PHP interpreter and the PHP extensions needed depends on the version of Concrete in use. Below you will find details for both supported major versions of Concrete.

Concrete Version 9

Version 9 is the current major release. It offers full support of PHP 8 and a minimum PHP version of 7.2.29. The latest released version of this series is considered to be the most secure and stable version.

PHP Status Version Notes
< 7.3 None Concrete CMS 9.0 requires PHP 7.3 or greater.
7.3 9.0+ (Note: PHP 7.3 is EOL)
7.4 9.0+
8.0 9.0.2+

- Not Possible
- Technically possible, but not currently recommended.
Recommended configuration.

Concrete Version 8

Version 8 is the previous major release of Concrete. Version 8.5 is guaranteed to receive security updates for major vulnerabilities until 1 May 2022 (as long as security updates are technically possible).

PHP Status Version Notes
< 5.5 None Concrete CMS 8 requires PHP 5.5.9 or greater.
5.5 8.0 - 8.5.7 (Note: PHP 5.5 is EOL)
5.6 8.0 - 8.5.7 (Note: PHP 5.6 is EOL)
7.0 8.0 - 8.5.7 (Note: PHP 7.0 is EOL)
7.1 8.0 - 8.5.7 (Note: PHP 7.1 is EOL)
7.2 8.4.3 - 8.5.7 (Note: PHP 7.2 is EOL)
7.3 8.5.0 - 8.5.7 (Note: PHP 7.3 is EOL)
7.4 8.5.0 - 8.5.7

- Not Possible
- Technically possible, but not currently recommended.
Recommended configuration.

Extensions

Concrete CMS requires the following PHP extensions:

  • MySQL (with PDO extensions)
  • DOM
  • SimpleXML
  • iconv
  • GD Library with Freetype
  • Fileinfo
  • Mbstring
  • CURL
  • ZipArchive (For automatic updates and community functionality)

Configuration

Concrete version 8.x requires the following configuration:

  • PHP Safe Mode Off
  • PHP Memory Limit at least 64 MB (more might be required for the processing and handling of large image files).

Web Server

Concrete supports both Apache and Nginx web servers, and has been made to work with IIS in the past. Official support is for Apache and Nginx only.

Database

MySQL (5.7 or higher) or MariaDB both work.

If using MySQL, ensure InnoDB tables are supported.

If possible, set the table row_format to dynamic to avoid problems with large forms.

Concrete Configuration Best Practices

Make sure to follow Configuration Best Practices to setup your site and harden your Concrete CMS