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Fatal error: Uncaught Error: Call to undefined function mysql_connect() in C:\xampp_New\htdocs\SQL\clases\clase_database.php:27 Stack trace: #0 C:\xampp_New\htdocs\SQL\importar_excel.php(32): clase_database->crear_conexion() #1 {main} thrown in C:\xampp_New\htdocs\SQL\clases\clase_database.php on line 27