What are some common errors or pitfalls when using mysqli_affected_rows in PHP, as seen in the forum thread?

One common pitfall when using mysqli_affected_rows in PHP is not checking for errors or handling them properly. It's important to remember that this function returns the number of affected rows by the last query, so it should be used immediately after executing an INSERT, UPDATE, DELETE, or REPLACE query. Additionally, it's crucial to ensure that the connection to the database is established before using this function. 

// Example of using mysqli_affected_rows with proper error handling

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

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

// Execute an SQL query
mysqli_query($connection, "UPDATE users SET name='John' WHERE id=1");

// Check for errors
if (mysqli_error($connection)) {
    echo "Error: " . mysqli_error($connection);
} else {
    // Get the number of affected rows
    $affected_rows = mysqli_affected_rows($connection);
    echo "Affected rows: " . $affected_rows;
}

// Close the connection
mysqli_close($connection);

Keywords

mysqli_affected_rows PHP errors pitfalls forum thread

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