How can error messages from MySQL be effectively interpreted and resolved in PHP?

When working with MySQL in PHP, error messages can provide valuable information about issues such as syntax errors, connection problems, or data mismatches. To effectively interpret and resolve these errors, you can use the mysqli_error() function to retrieve the error message and mysqli_errno() function to get the error number. By checking these values, you can identify the problem and take appropriate action, such as adjusting the SQL query or handling connection errors. 

// 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);
}

// Perform SQL query
$query = "SELECT * FROM users WHERE id = 1";
$result = $mysqli->query($query);

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

// Process query results
while ($row = $result->fetch_assoc()) {
    // Handle data
}

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

Keywords

MySQL error messages interpretation resolution PHP

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