Letters class example with exceptions and api message returns

letters.php

<?php
class Letters{

	private function getLetter($letter)
	{
		// get a ketter from the database
		// bla bla blatriming, and geting for db
		$letter = getFromDB(trim($letter));
		if (!$letter) throw new \LetterException('Letter "'.$letter.'" was not found in the database');
		return $letter;
	}

	private function lettersPlay(..$letters)
	{
		$dominoFinished = playDomino($ltters);
		if (!$dominoFinished) throw new \DominoException('Letters cant play domino');
	}

	public function playAction()
	{
		try {
			$a = getLetter('a');
			$b = getLetter('b');
			$c = getLetter('c');
			$d = getLetter('d');
			$e = getLetter('e');
			$f = getLetter('f');
			$this->lettersPlay($a, $b, $c, $d, $e, $f);
			$this->response('Play was successful');
		} catch (\LetterException $e) {
			$this->response('Dear user. We had a problem findin a letter. ' . $e->getMessage());
		} catch (\DominoException $e) {
			$this->response('Dear user. Domino play wan\'t successful' . $e->getMessage());
		} catch (\Exception $e) {
			$this->response('Dear user. Unexpected error occured: ' . $e->getMessage());
		}
	}
}

lettersB.php

<?php
class Letters{

	public function playAction()
	{
		$a = getLetter('a');
		if (!$a) {
			$this->response('Dear user. Letter a was not found');			
		}

		$b = getLetter('b');
		if (!$b) {
			$this->response('Dear user. Letter b was not found');			
		}

		$c = getLetter('c');
		if (!$c) {
			$this->response('Dear user. Letter c was not found');			
		}

		$d = getLetter('d');
		if (!$d) {
			$this->response('Dear user. Letter d was not found');			
		}

		$e = getLetter('e');
		if (!$e) {
			$this->response('Dear user. Letter e was not found');			
		}

		$f = getLetter('f');
		if (!$f) {
			$this->response('Dear user. Letter f was not found');			
		}

		$gameResult = $this->lettersPlay($a, $b, $c, $d, $e, $f);
		if (!$gameResult) {
			$this->response('Dear user. game failed');			
		}
	}
}