Trait #

<?php
trait Loggable
{
    public function log(string $message): void
    {
        echo "[" . date('Y-m-d H:i:s') . "] $message\n";
    }
}

<?php
class UserService
{
    use Loggable;
    
    public function create(array $data): User
    {
        $this->log("Creating user");
        return new User($data);
    }
}

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

trait Timestampable
{
    public function touch(): void
    {
        $this->updatedAt = new DateTime();
    }
}

class User
{
    use Loggable, Timestampable;
}

<?php
trait A
{
    public function foo(): void
    {
        echo "A::foo\n";
    }
}

trait B
{
    public function foo(): void
    {
        echo "B::foo\n";
    }
}

class Example
{
    use A, B {
        A::foo insteadof B;
        B::foo as bar;
    }
}

$example = new Example();
$example->foo();
$example->bar();

<?php
trait ExampleTrait
{
    private function secret(): void
    {
        echo "Secret\n";
    }
}

class Example
{
    use ExampleTrait {
        secret as public;
    }
}

<?php
trait Validator
{
    abstract protected function getRules(): array;
    
    public function validate(array $data): bool
    {
        $rules = $this->getRules();
        
        return true;
    }
}

class UserForm
{
    use Validator;
    
    protected function getRules(): array
    {
        return [
            'name' => 'required',
            'email' => 'required|email'
        ];
    }
}

<?php
trait SoftDeletes
{
    protected ?DateTime $deletedAt = null;
    
    public function delete(): void
    {
        $this->deletedAt = new DateTime();
    }
    
    public function restore(): void
    {
        $this->deletedAt = null;
    }
    
    public function isDeleted(): bool
    {
        return $this->deletedAt !== null;
    }
}

<?php
trait HasTimestamps
{
    public DateTime $createdAt;
    public DateTime $updatedAt;
    
    public function touch(): void
    {
        $this->updatedAt = new DateTime();
    }
}