mysqli_fetch_array() Error: Why Does It Expect a mysqli_result and How Can I Fix It?

mysqli_fetch_array() Parameter Error: Debugging and Solution

Your error "mysqli_fetch_array() expects parameter 1 to be mysqli_result, boolean given" indicates that the query you're passing to mysqli_query() is failing and returning a boolean (false) instead of a valid mysqli_result object.

To determine the exact cause of the query failure, add the following code after mysqli_query() to trigger an error message:

if (!$check1_res) {
    trigger_error(mysqli_error($con), E_USER_ERROR);
}

This will display the error message generated by the MySQL server, providing you with valuable information about the specific query issue.

Additional Debugging Tips:

• Double-check the query syntax for any errors or typos.
• Ensure that the database connection ($con) is valid and connected to the correct database.
• Check if the username and password used for the database connection have sufficient privileges to access the table.
• Verify that the table (users) referenced in the query actually exists.

Possible Causes of False Query Result:

• Incorrect table name
• Invalid syntax in the query (e.g., missing closing parenthesis)
• Table or field names misspelled
• Missing or malformed WHERE clause

By following these troubleshooting steps, you can pinpoint the cause of the query failure and resolve the problem accordingly.

The above is the detailed content of mysqli_fetch_array() Error: Why Does It Expect a mysqli_result and How Can I Fix It?. For more information, please follow other related articles on the PHP Chinese website!