Trait and static method.

Trait-static-method.php

<?php

/**
 * FileGenerator.
 */
trait FileGeneratorTrait
{
  public static function generateFile() {
    echo "generating file \n";
  }
}


class MyClass {
  use FileGeneratorTrait;

  public function create() {
    // In class's method trait's STATIC method can be accessed with self:: and $this.
    self::generateFile();
    $this->generateFile();
  }
}

$obj = new MyClass();
$obj->create();

//output:
//generating file
// generating file

trait ImageGeneratorTrait {
  protected $messenger;
  protected static $painter;

  public function messenger() {
    $this->messenger = 'Here';
    echo $this->messenger;
  }

  public static function painter() {
    self::$painter = 'My painter';
    echo self::$painter;
  }
}

class ImageGenerator {
  use ImageGeneratorTrait;

  public static function generate() {
    // In class's STATIC method trait's method can't be accessed with $this.
    $this->messenger(); // This will throw error.
  }

  public static function paint() {
    // In class's STATIC method trait's STATIC method can't be accessed with self.
    self::painter();
  }
}

$o = new ImageGenerator();
// ImageGenerator::generate();
ImageGenerator::paint();