What is the common error message associated with mysqli usage in PHP?

When using mysqli in PHP, a common error message is "Warning: mysqli_fetch_assoc() expects parameter 1 to be mysqli_result, boolean given." This error occurs when the query executed by mysqli_query() fails, and it returns false instead of a result set. To solve this issue, you should always check the return value of mysqli_query() before trying to fetch data from the result set. 

// Check if the query executed successfully before fetching data
$result = mysqli_query($conn, "SELECT * FROM table");
if ($result) {
    while ($row = mysqli_fetch_assoc($result)) {
        // Process the fetched data
    }
} else {
    echo "Error executing query: " . mysqli_error($conn);
}

Keywords

mysqli PHP error message database connection syntax error

Related Questions