De quoi s'agit-il ?

Fatal error: Uncaught Error: Call to undefined function mysql_connect() in /homepages/11/d189569012/htdocs/dayluck_racine/dayluck/general/include/connection_bdd/connection_bdd_glom2.php:3 Stack trace: #0 /homepages/11/d189569012/htdocs/dayluck_racine/dayluck/general/include/temps/la_date.php(49): include() #1 /homepages/11/d189569012/htdocs/dayluck_racine/dayluck/nous/explication.php(31): include('/homepages/11/d...') #2 {main} thrown in /homepages/11/d189569012/htdocs/dayluck_racine/dayluck/general/include/connection_bdd/connection_bdd_glom2.php on line 3