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HTML / CSS / JS

<?php
trait Logger
{
    public function log(string $message): void
    {
        echo "[Logger] $message
";
    }

public function format(string $text): string
    {
        return strtoupper($text);
    }
}

trait Debugger
{
    public function log(string $message): void
    {
        echo "[Debugger] " . date('H:i:s') . " $message
";
    }

public function format(string $text): string
    {
        return "DEBUG: $text";
    }
}

class Application
{
    use Logger, Debugger {
        // Conflict resolution for log()
        Logger::log   insteadof Debugger; // use Logger's log()
        Debugger::log as debugLog;        // also keep Debugger's as debugLog()

// Conflict resolution for format()
        Debugger::format insteadof Logger; // use Debugger's format()
        Logger::format   as loggerFormat;  // keep Logger's as loggerFormat()
    }
}

$app = new Application();
$app->log('Application started');         // [Logger] Application started
$app->debugLog('Checking state...');      // [Debugger] 14:00:00 Checking state...
echo $app->format('hello');              // DEBUG: hello
echo $app->loggerFormat('hello');        // HELLO

// Change visibility with 'as'
trait Greet
{
    public function hello(): string { return 'Hello!'; }
}
class Shy
{
    use Greet {
        hello as private; // make it private within this class
    }
}