February 12, 2011 
Definition:
function _get_dropins() {}
Returns drop-ins that WordPress uses.
Includes Multisite drop-ins only when is_multisite()
Return values
returns:Key is file name. The value is an array, with the first value the purpose of the drop-in and the second value the name of the constant that must be true for the drop-in to be used, or true if no constant is required.
Source code
function _get_dropins() {
$dropins = array(
'advanced-cache.php' => array( __( 'Advanced caching plugin.' ), 'WP_CACHE' ), // WP_CACHE
'db.php' => array( __( 'Custom database class.' ), true ), // auto on load
'db-error.php' => array( __( 'Custom database error message.' ), true ), // auto on error
'install.php' => array( __( 'Custom install script.' ), true ), // auto on install
'maintenance.php' => array( __( 'Custom maintenance message.' ), true ), // auto on maintenance
'object-cache.php' => array( __( 'External object cache.' ), true ), // auto on load
);
if ( is_multisite() ) {
$dropins['sunrise.php' ] = array( __( 'Executed before Multisite is loaded.' ), 'SUNRISE' ); // SUNRISE
$dropins['blog-deleted.php' ] = array( __( 'Custom site deleted message.' ), true ); // auto on deleted blog
$dropins['blog-inactive.php' ] = array( __( 'Custom site inactive message.' ), true ); // auto on inactive blog
$dropins['blog-suspended.php'] = array( __( 'Custom site suspended message.' ), true ); // auto on archived or spammed blog
}
return $dropins;
}
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A HitchHackers guide through WordPress 
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