How can debugging techniques be applied to troubleshoot PHP mysqli queries?

To troubleshoot PHP mysqli queries, you can apply debugging techniques such as checking for errors, printing out query results, and using functions like mysqli_error() to identify issues. By carefully examining the query syntax, connection settings, and data being passed, you can pinpoint and resolve any problems. 

// Example PHP code snippet for debugging mysqli queries
$conn = new mysqli($servername, $username, $password, $dbname);

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

$sql = "SELECT * FROM table_name";
$result = $conn->query($sql);

if ($result === false) {
    echo "Error: " . $conn->error;
} else {
    while($row = $result->fetch_assoc()) {
        echo "Column1: " . $row["column1"]. " - Column2: " . $row["column2"]. "<br>";
    }
}

$conn->close();

Keywords

PHP mysqli debugging queries troubleshooting

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