Fatal error: Uncaught TypeError: mysqli_fetch_assoc(): Argument #1 ($result) must be of type mysqli_result, bool given in C:\tlab.cn\php\php13cyn\multi_del\index.php:9 Stack trace: #0 C:\tlab.cn\php\php13cyn\multi_del\index.php(9): mysqli_fetch_assoc() #1 {main} thrown in C:\tlab.cn\php\php13cyn\multi_del\index.php on line 9

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