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Warning: Undefined array key "username" in /home/gjzhou/public_html/acad280/labs/insert_oop.php on line 15

Fatal error: Uncaught Error: mysqli object is already closed in /home/gjzhou/public_html/acad280/labs/insert_oop.php:15 Stack trace: #0 /home/gjzhou/public_html/acad280/labs/insert_oop.php(15): mysqli->real_escape_string('') #1 {main} thrown in /home/gjzhou/public_html/acad280/labs/insert_oop.php on line 15