How can I troubleshoot the issue of “ warning:mysql_fetch array() expects parameter 1 to be resource, Boolean given” in MySQL?

 If you are getting the issue message of “ warning:mysql_fetch array() expects parameter 1 to be resource, Boolean given” while using MySQL, then it generally refers that the execution of the query did not return a valid set of results. Here are the steps given for how you can troubleshoot this particular issue:-

Checking the SQL query

Firstly, try to check the SQL query for the verification of any issues or errors. Ensure that the query should be correct and it should be implemented successfully.

Verifying database connection

Ensure also that the connection of the database should be established successfully before trying to execute the query.

Checking for errors in query execution

After completing the process of execution of the query by using “mysql_ query()”, now check for the error by using the “mysql _error($connection). This would provide insights into why the query failed:-

$result = mysqli_query($connection, $query);
If (!$result) {
    Die(‘Query failed: ‘ . mysqli_error($connection));
}
Ensuring the result is set before fetching
Try to ensure that the execution of the query is successfully done before calling the “mysql_fetch_array()” so that it can return a valid set of results. 
$result = mysqli_query($connection, $query);
If ($result && mysqli_num_rows($result) > 0) {
    // Fetch data using mysqli_fetch_array()
    $row = mysqli_fetch_array($result);
} else {
    // Handle cases where no results or queries failed
}

By using the above given steps you can surely identify and even troubleshoot the issue.