设置限制以使用目录中的短语显示文本文件（仅限5个文件）

Question

I'm new at php but I want to create script to show me for example how many words are in txt files in a specify directory . But I want to choose from how many files I get the answer. In the directory are 20 files but I want my script to only show my words from 5 files (new files).

For now I have a script which shows words from all files in the directory.

I don't know how to set up limits. Could you help me?

$path_to_check = 'logs/';
$needle = 'error';
$tot = 0;
$numberOfFiles = 2;
foreach(glob($path_to_check . '*.txt') as $filename)
{
  foreach(file($filename) as $fli=>$fl)
  {
    if(strpos($fl, $needle)!==false)
    {
      $tot++;
      echo  '  <br> ' . $filename . '<br> line ' . ($fli+1) . ':<br> ' . $fl;

    }
  }
}