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Warning: Undefined variable $db in /home/mobilemasters/public_html/api/logout.php on line 19

Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /home/mobilemasters/public_html/api/logout.php:19 Stack trace: #0 /home/mobilemasters/public_html/api/logout.php(19): mysqli_query(NULL, 'select * from t...') #1 {main} thrown in /home/mobilemasters/public_html/api/logout.php on line 19