Find out which words are most commonly used in song lyrics.

wordcount.php

<?php

/**
 * @file
 * Find out which words are most commonly used in song lyrics.
 */

$wordcounts = array();
$lines = file('album/song.txt');
foreach ($lines as $line_num => $line) {
  $line = strtolower($line);
  $words = split(' ', $line);
  foreach ($words as $word) {
    $word = preg_replace('/[^\w]*/', '', $word);
    $wordcounts[$word]++;
  }
}
asort($wordcounts);
foreach ($wordcounts as $word => $wordcount) {
  echo "$word, $wordcount\n";
}