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Fatal error: Uncaught Error: mysqli object is already closed in /home/tongfeiz/public_html/acad276/demo1121/sql_to_json.php:17 Stack trace: #0 /home/tongfeiz/public_html/acad276/demo1121/sql_to_json.php(17): mysqli->set_charset('utf8') #1 {main} thrown in /home/tongfeiz/public_html/acad276/demo1121/sql_to_json.php on line 17