Функция preg_grep в PHP

   <?
    $oldArray = array('Николай', 'Евгений', 'Константин', 'Пётр', 'Иннокентий');
    $oldArray = preg_grep("/^[а-яА-ЯёЁ]{7,}$/u", $oldArray);
   
    $currentKeyNumber = 0;
    foreach($oldArray as $Key => $Value)
    {
     $newArray[$currentKeyNumber] = $Value;
     unset($oldArray[$Key]);
     $currentKeyNumber++;
    }
   
    foreach($newArray as $Key => $Value) echo $Key.' =&gt; '.$Value.'<br>';
   ?>