What are the potential reasons for the error message "Warning: mysqli_affected_rows() expects parameter 1 to be mysqli, string given" when using mysqli functions in PHP?

The error message "Warning: mysqli_affected_rows() expects parameter 1 to be mysqli, string given" occurs when the mysqli_affected_rows() function is expecting a mysqli object as its parameter, but instead, a string is being passed to it. This typically happens when the database connection is not properly established before calling the function. To solve this issue, make sure to establish a valid mysqli connection before using the mysqli_affected_rows() function. 

// Establish a MySQL database connection
$connection = mysqli_connect("localhost", "username", "password", "database");

// Check if the connection is successful
if (!$connection) {
    die("Connection failed: " . mysqli_connect_error());
}

// Perform database operations

// Close the database connection
mysqli_close($connection);

Keywords

mysqli_affected_rows parameter mysqli string error message

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