Note: This documentation is for Moodle 2.7. For up-to-date documentation see admin/environment/custom check/php check php533.

admin/environment/custom check/php check php533

From MoodleDocs

Moodle 2.0 will require PHP 5.2.8 or later. However PHP 5.3.3 or later is recommended.

PHP 5.3.3 has better stability, security and memory management compared to 5.2.8.

See also