$myVar = "Hello World!"; echo "DEBUG: The value of myVar is " . $myVar;
$myVar = "Hello World!"; error_log("DEBUG: The value of myVar is " . $myVar);
use Monolog\Logger; use Monolog\Handler\StreamHandler; $log = new Logger('debug'); $log->pushHandler(new StreamHandler('debug.log', Logger::DEBUG)); $log->debug('The value of myVar is ' . $myVar);This example uses the Monolog package/library to handle debug messages. It creates a new logger object, adds a handler to write messages to a file, and then logs a debug message that includes the value of $myVar. In summary, debug messages are an important tool for developers to use when debugging their PHP code. They can be printed to the screen, written to log files, or handled by package/libraries such as Monolog.