How can debugging tools like mysqli->error help in identifying issues in PHP scripts?

Debugging tools like mysqli->error can help in identifying issues in PHP scripts by providing detailed error messages when there is a problem with database queries. By using mysqli->error, developers can quickly pinpoint where the issue lies, whether it's a syntax error, a connection problem, or a query problem. This information can then be used to troubleshoot and fix the problem efficiently.

// Example of using mysqli->error to identify database query issues
$conn = new mysqli($servername, $username, $password, $dbname);

// Check connection
if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
}

$sql = "SELECT * FROM users WHERE id = 1";
$result = $conn->query($sql);

if (!$result) {
    echo "Error: " . $conn->error;
} else {
    // Process the query result
}

$conn->close();