How can debugging techniques be used to troubleshoot MySQL query issues in PHP?

To troubleshoot MySQL query issues in PHP, you can use debugging techniques such as printing out the query itself, checking for errors returned by MySQL, and using functions like mysqli_error() to get more information about the issue. By carefully examining these outputs, you can identify and fix any problems with your MySQL queries.

// Example code snippet to troubleshoot MySQL query issues in PHP
$query = "SELECT * FROM users WHERE id = 1";
$result = mysqli_query($connection, $query);

if (!$result) {
    echo "Error: " . mysqli_error($connection);
} else {
    while ($row = mysqli_fetch_assoc($result)) {
        // Process the data here
    }
}