Manual:$wgExceptionHooks/de-formal

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<translate> This feature was removed completely in version <tvar name=ver>1.30.0</tvar>.</translate>

<translate> Extensions</translate>: $wgExceptionHooks
Hooks that are used for outputting exceptions.
<translate> Introduced in version:</translate>	1.12.0 (r29444)
<translate> Removed in version:</translate>	1.30.0 (Gerrit change 355060; git #I85844a2)
<translate> Allowed values:</translate>	(array of callbacks)
<translate> Default value:</translate>	`[]`
<translate> Other settings:</translate> <translate> Alphabetical</translate> \| <translate> By function</translate>

Details

Hooks that are used for outputting exceptions. Format is:

$wgExceptionHooks['MWException'][] = $funcname;

or:

$wgExceptionHooks['MWException'][] = array( $class, $funcname /*, extra args... */ );

Hooks receive the exception object as their first argument and should return strings or false.