cache_format

Name: Caching Format to Use Type: Number Default: 0 Available In: Revolution 2.1+ Removed from manager UI: Revolution 3.3.0

Values:

• 0: PHP arrays
• 1: JSON
• 2: PHP serialized data

IMPORTANT: Do not change this value in System Settings. If you edit it in the manager, MODX writes new-format cache while old-format files still sit on disk. The site and the manager then fail to boot.

From Revolution 3.3.0 the setting no longer appears in the manager. To override the default, set it in $config_options in core/config/config.inc.php, then empty the core/cache/ directory:

$config_options = [
    'cache_format' => 0, // 0 = PHP, 1 = JSON, 2 = serialize
];

See also: Using Memcache for another $config_options example.