How can one effectively troubleshoot and debug MySQL queries in PHP to ensure accurate results?

To effectively troubleshoot and debug MySQL queries in PHP, you can start by enabling error reporting to catch any syntax errors or connection issues. Additionally, you can use functions like mysqli_error() to display specific error messages from MySQL. It's also helpful to echo or var_dump the query string to ensure it's being constructed correctly. 

// Enable error reporting
mysqli_report(MYSQLI_REPORT_ERROR | MYSQLI_REPORT_STRICT);

// Connect to MySQL database
$mysqli = new mysqli("localhost", "username", "password", "database");

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

// Construct and execute MySQL query
$query = "SELECT * FROM table";
$result = $mysqli->query($query);

// Check for query errors
if (!$result) {
    echo "Error: " . $mysqli->error;
}

// Fetch and display results
while ($row = $result->fetch_assoc()) {
    echo $row['column_name'] . "<br>";
}

// Close connection
$mysqli->close();

Keywords

MySQL PHP debugging troubleshooting query optimization

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