Make logic of duplicate word count.

$str = 'Love a and peace love a and peace love a and peace love a and peace love a and peace love a and peace';

// Build a histogram mapping words to occurrence counts
$hist = array();

// Split on any number of consecutive whitespace characters
foreach (preg_split('/\s+/', $str) as $word)
{
  // Force all words lowercase to ignore capitalization differences
  $word = strtolower($word);

  // Count occurrences of the word
  if (isset($hist[$word]))
  {
    $hist[$word]++;
  }
  else
  {
    $hist[$word] = 1;
  }
}

// Once you're done, extract only the counts
$vals = array_values($hist);
rsort($vals); // Sort max to min

// Now that you have the counts, analyze and decide valid/invalid
var_dump($vals);