What debugging techniques can be used to troubleshoot issues with updating multiple rows in a database using PHP forms?

When troubleshooting issues with updating multiple rows in a database using PHP forms, one common technique is to check the SQL query being generated to ensure it is updating the correct rows. Another technique is to echo out variables at different stages of the update process to identify any errors or unexpected values. Additionally, using error handling functions like mysqli_error() can help pinpoint any SQL syntax errors.

// Sample code snippet for updating multiple rows in a database using PHP forms

// Assuming $db is your database connection

// Check the SQL query being generated
$sql = "UPDATE table_name SET column1 = value1, column2 = value2 WHERE condition";
echo $sql;

// Execute the query
if(mysqli_query($db, $sql)){
    echo "Records updated successfully";
} else{
    echo "Error updating records: " . mysqli_error($db);
}