Take array of words and remove any that are anagrams of any other words in array

de-anagram.php

<?php

// file has 9-letter words
// and looks like this
/*
{
  "9": [
    "aardvarks",
    ...
    "xenomorph"
  ]
}
*/

$filename = '';

if (isset($argv[1])) {
  $filename = $argv[1];
} else {
  echo "Error: No filename provided.\n";
  exit(1);
}

$WORDS_INPUT_JSON_FILE = $filename;
$WORDS_OUTPUT_JSON_FILE = 'de-anagrammed/' . $filename . '.de-anagrammed.json';

if ($response = file_get_contents($WORDS_INPUT_JSON_FILE)) {
  $words = json_decode($response, true)[9];
  echo "checking " . count($words) . " words\n";
} else {
  echo "Error: Could not load filename.\n";
  exit(1);
}

$isUnique = false;
$min = 0;
$max = count($words);
$potentialWord = '';
$uniqueWords = [];

for ($i = 0; $i < $max; $i++) {
  echo "[word #$i]\r";

  $anagramsFound = 0;
  $potentialWord = $words[$i];

  foreach ($words as $word) {
    if ($word != $potentialWord) {
      $arr1 = str_split(strtolower($word));
      sort($arr1);
      $word1 = implode($arr1);
      $arr2 = str_split(strtolower($potentialWord));
      sort($arr2);
      $word2 = implode($arr2);

      if ($word1 == $word2) {
        $anagramsFound++;
      }
    }
  }

  if ($anagramsFound == 0) {
    $isUnique = true;
    array_push($uniqueWords, $potentialWord);
  }
}

if ($isUnique) {
  echo "-----------------------------------------------------------\n";
  echo "found _" . count($uniqueWords) . "_ word(s) with no anagrams in corpus\n";
  echo "-----------------------------------------------------------\n";

  if ($fp = fopen($WORDS_OUTPUT_JSON_FILE, 'w')) {
    if (fwrite($fp, json_encode(array('9' => $uniqueWords)))) {
      echo "-> wrote output json file successfully: " . $WORDS_OUTPUT_JSON_FILE . "\n";
    } else {
      echo "Error: Could not write to output file.\n";
      exit(1);
    }
    fclose($fp);
  }
} else {
  echo "-----------------------------------------------------------\n";
  echo "all words have a 9-letter anagram somewhere in the corpus!\n";
  echo "-----------------------------------------------------------\n";
}

?>