Fatal error: Uncaught Error: Call to a member function update() on null in C:\xampp\htdocs\OOP\classes\user.class.php:34 Stack trace: #0 C:\xampp\htdocs\OOP\index.php(13): User->update_by_id(Array, 1) #1 {main} thrown in C:\xampp\htdocs\OOP\classes\user.class.php on line 34
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