Tells the number of uses of words, ordered from most to least frequent

count-words.php

#!/usr/bin/php
<?php # Axiixc [ 2009 ]

$input = $argv[1];
$files = array();
if (is_dir($input))
{
   $files = scandir($input);
   foreach ($files as $key => $value)
      $files[$key] = $input . '/' . $value;
}
else
   $files[] = $input;

$counter = 0;
$word_list = array();
foreach ($files as $file)
{
   if (substr($file, -9) != '.DS_Store' && !is_dir($file))
   {
      $file = strtolower(file_get_contents($path . $file));
      $file = preg_replace('/[^A-Za-z0-9\' ]/', ' ', $file);
      foreach(explode(' ', $file) as $word)
      {
         if ($word != ' ' and $word != '')
         {   
            $word = strtolower($word);
            $counter++;
            $word_list[$word]++;
         }
      }
   }
}

arsort($word_list);

echo "$counter : Total Words\n";
foreach ($word_list as $word => $count)
   echo "$count : $word\n";