Helper para remover acentos das strings

Helper.php

<?php
class Helper {
  
  /**
  * Remove acentos das strings
  */
  public static function removerAcentos($string) {
    return strtr($string, array (
                      			'à' => 'a', 'á' => 'a', 'â' => 'a', 'ã' => 'a', 'ä' => 'a', 'å' => 'a', 'æ' => 'a', 
                      			'ç' => 'c', 
                      			'è' => 'e', 'é' => 'e', 'ê' => 'e', 'ë' => 'e', 
                      			'ì' => 'i', 'í' => 'i', 'î' => 'i', 'ï' => 'i',
                      			'ð' => 'o', 'ò' => 'o', 'ó' => 'o', 'ô' => 'o', 'õ' => 'o', 'ö' => 'o', 'ø' => 'o',
                      			'ñ' => 'n', 
                      			'ù' => 'u', 'ú' => 'u', 'û' => 'u', 'ý' => 'y',
                      			'þ' => 'b', 
                      			'ÿ' => 'y'));
  }
}

echo Helper::removerAcentos('áéíçãõúñ');

strtr($string, 'àáâãäåæçèéêëìíîïðòóôõöøñùúûýþÿ', 'aaaaaaaceeeeiiiiooooooonuuuyby');