gplx/mediawiki/extensions/SemanticMediaWiki/docs/technical/hooks/hook.constraint.initconstra...

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## SMW::Constraint::initConstraints
* Since: 3.1
* Description: Hook to allow adding custom constraint checks for a `custom_constraint`.
* Reference class: [`ConstraintRegistry.php`][ConstraintRegistry.php]
### Signature
```php
use MediaWiki\MediaWikiServices;
MediaWikiServices::getInstance()->getHookContainer()->register( 'SMW::Constraint::initConstraints', function( $constraintRegistry ) {
return true;
} );
```
[ConstraintRegistry.php]:https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/master/src/Constraint/ConstraintRegistry.php
## See also
- [register.custom.constraint.md][register.custom.constraint]
[register.custom.constraint]:https://github.com/SemanticMediaWiki/SemanticMediaWiki/blob/master/docs/examples/register.custom.constraint.md