System Requirements

Version 8 system requirements

• We recommend PHP 7.2 or whatever is latest (PHP 5.5.9 is the minimum)
• The following PHP extensions:
  • MySQL (with PDO extensions)
  • DOM
  • SimpleXML
  • iconv
  • GD Library with Freetype
  • Fileinfo
  • Mbstring
  • CURL
  • Mcrypt
  • ZipArchive (For automatic updates and community functionality)
• PHP Safe Mode Off
• PHP Memory Limit at least 64 MB (more might be required for the processing and handling of large image files.)
• MySQL 5.1.5 or Higher, or MariaDB
• MySQL InnoDB Table Support

Version 7 system requirements

• PHP 5.3.3 - PHP 7.1.x (PHP 7.2 is not supported)
• The following PHP extensions:
  • MySQL (with PDO extensions)
  • DOM
  • SimpleXML
  • GD Library with Freetype
  • CURL
  • Mcrypt
  • ZipArchive (For automatic updates and community functionality)
• PHP Safe Mode Off
• PHP Memory Limit at least 64 MB (more might be required for the processing and handling of large image files.)
• MySQL 5.1.5 or Higher, or MariaDB
• MySQL InnoDB Table Support

concrete5 is typically used with Apache 2, but is built to work with any standard HTTP webserver. Some webservers may require additional configuration, so check the forums if you run into issues.