PHP Warning: solution to mysqli_warning::fetch_assoc()

In PHP programming, you often encounter various error prompts. One of the common errors is "PHP Warning: mysqli_warning::fetch_assoc()", which usually occurs when using the mysqli database extension.

The reason why this error occurs is because the mysqli_warning::fetch_assoc() method requires the result set to be a warning type (warning). This method returns a warning signal when the result set is not a warning, causing this error to occur.

To solve this error, we need to check whether there are statements using the mysqli_warning::fetch_assoc() method in the code. If so, we need to check if the parameters of the method are correct.

If the parameters are correct, we need to confirm whether the result set is a warning type. If the result set is not a warning type, we need to use the correct method to get the result set. Here are some workarounds:

1. Use the mysqli_warning::next() method to get the result set

The mysqli_warning::next() method returns the next warning or error if If there are no warnings or errors, return false. Therefore, we can use this method to get a result set of warning type.

Sample code:

$warning = $mysqli->get_warnings();
if ($warning) {
    foreach ($warning as $w) {
        $result = $w->fetch_assoc();
        // do something with $result
    }
}

2. Use the mysqli_result::fetch_assoc() method to obtain the result set

The mysqli_result::fetch_assoc() method is used to obtain the association Result set of array type. If the result set is not an associative array type, this method returns false. Therefore, we can use the mysqli_warning::fetch_assoc() and mysqli_result::fetch_assoc() methods in combination to get the result set.

Sample code:

$warning = $mysqli->get_warnings();
if ($warning) {
    foreach ($warning as $w) {
        $result = $w instanceof mysqli_result ? $w->fetch_assoc() : $w;
        // do something with $result
    }
}

Summary

In PHP programming, we need to carefully check the code that uses the mysqli_warning::fetch_assoc() method to ensure that the parameters of the method are correct And the result set is of warning type. If the result set is not of warning type, we can use the mysqli_warning::next() method or the mysqli_result::fetch_assoc() method to get the result set. These methods can help us solve the "PHP Warning: mysqli_warning::fetch_assoc()" error and ensure that our program runs normally.

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