PDOException: SQLSTATE[23000]: Integrity constraint violation: 1451 Cannot delete or update a parent row: a foreign key constraint fails (`stagiaires`.`cours`, CONSTRAINT `cours_formation1_FK` FOREIGN KEY (`id_formation`) REFERENCES `formation` (`id_formation`)) in /var/www/gestionstagiaires.b-alashoush.fr/model/Formation.php:88 Stack trace: #0 /var/www/gestionstagiaires.b-alashoush.fr/model/Formation.php(88): PDOStatement->execute() #1 /var/www/gestionstagiaires.b-alashoush.fr/controller/formationController.php(27): Formation->deleteFormation() #2 /var/www/gestionstagiaires.b-alashoush.fr/index.php(36): include('...') #3 {main}