How can one troubleshoot and debug PHP code that is not successfully updating database values?

To troubleshoot and debug PHP code that is not successfully updating database values, you can start by checking for errors in your SQL query, ensuring that the connection to the database is successful, and verifying that the data being passed to the query is correct. You can also use functions like mysqli_error() to get detailed error messages from the database. 

// Example PHP code snippet to update a database value
$conn = new mysqli($servername, $username, $password, $dbname);

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

// Update query
$sql = "UPDATE table_name SET column_name = 'new_value' WHERE condition";

if ($conn->query($sql) === TRUE) {
    echo "Record updated successfully";
} else {
    echo "Error updating record: " . $conn->error;
}

$conn->close();

Keywords

PHP debugging database SQL error handling

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