What to do if php cannot add data

Solution to the problem that php cannot add data: 1. Open the corresponding php file; 2. Check the "mysqli_query" statement; 3. Change the sentence "if (mysqli_query($conn, $a))" to Just "if($a)".

The operating environment of this tutorial: Windows 7 system, PHP version 8.1, Dell G3 computer.

What should I do if php cannot add data?

Problem description:

The database can be connected successfully, but PHP cannot insert data. Can anyone check if there is a problem with the code? ?

" . mysqli_error($conn);
}
mysqli_close($conn);
}
?>

Problem solution:

$a=mysqli_query($conn,"INSERT INTO student.plus1 (用户名, 密码, 性别, 学历) VALUES ('$x','$y','$Z','$O')");

This sentence means that the insert statement has been executed. Mysqli_query executes the query statement and returns the object. If the insert statement is successfully executed, true will be returned.

if (mysqli_query($conn, $a)) Just change this sentence to if ($a).

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