If you're a developer who works with MySQL databases, you may have encountered the mysqli_fetch_array() error due to wrong parameter type. This error can be frustrating because it can prevent your code from running correctly. In this guide, we'll explain what causes this error and provide a step-by-step solution.
What Causes the mysqli_fetch_array() Error?
The mysqli_fetch_array() function is used to fetch a result row as an associative array, a numeric array, or both. It takes two parameters: the first parameter is the result set returned by the mysqli_query() function, and the second parameter is an optional constant that specifies the type of array to return.
The error occurs when the second parameter of the mysqli_fetch_array() function is not of the correct type. This can happen if you pass it a string instead of a constant.
Step-by-Step Solution
To fix the mysqli_fetch_array() error due to wrong parameter type, follow these steps:
Check the second parameter of the mysqli_fetch_array() function to make sure it is a constant. Constants are predefined values that cannot be changed during the execution of a script.
Make sure that the constant you are using is one of the following:
MYSQLI_ASSOC- returns an associative arrayMYSQLI_NUM- returns a numeric arrayMYSQLI_BOTH- returns both an associative array and a numeric array
If you are using a string instead of a constant, replace it with the appropriate constant.
If you are still receiving the error, check that the result set returned by the mysqli_query() function is not empty. If it is empty, the mysqli_fetch_array() function will return false.
If none of these steps resolve the error, check that you have established a connection to the MySQL database using the mysqli_connect() function.
Frequently Asked Questions
What is the mysqli_fetch_array() function?
The mysqli_fetch_array() function is used to fetch a result row as an associative array, a numeric array, or both.
What is a constant?
A constant is a predefined value that cannot be changed during the execution of a script.
What are the constants that can be used with the mysqli_fetch_array() function?
The constants that can be used with the mysqli_fetch_array() function are MYSQLI_ASSOC, MYSQLI_NUM, and MYSQLI_BOTH.
What should I do if the result set returned by the mysqli_query() function is empty?
If the result set returned by the mysqli_query() function is empty, the mysqli_fetch_array() function will return false. You should check that the result set is not empty before using the mysqli_fetch_array() function.
How do I establish a connection to the MySQL database using the mysqli_connect() function?
To establish a connection to the MySQL database using the mysqli_connect() function, you need to provide the following information:
- The hostname of the MySQL server
- The username and password used to connect to the MySQL server
- The name of the database you want to connect to