Manual:$wgReadOnly

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Wiki locking: $wgReadOnly
Disallows editing, displaying the string given as the reason.
Introduced in version: pre 1.1.0
Removed in version: still in use
Allowed values: (string), null/false
Default value: null
false, prior to 1.5.7

Other settings: Alphabetical | By Function


[edit] Details

If set to a string (e.g., in LocalSettings.php), $wgReadOnly disallows editing, displaying the string given as the reason. Functionally the same as $wgReadOnlyFile, but using a variable instead of a file.
Note that some of your installed extensions may write data nontheless.

$wgReadOnly = 'site maintenance';

The above example locks the database and provides a default statement on edit pages and also gives the included string 'site maintenance' as an explanation for why the database was locked.