function generateSearchKey($text)
{
$stopWords = getSearchKeyStopWords();
$text = strtolower($text);
$tokens = split(' ', $text);
$ok_words = array();
foreach ($tokens as $t) {
if ($t == '' || isset($stopWords[$t])) {
continue;
}
$ok_words[] = $t;
}
sort($ok_words);
$key = join(' ', $ok_words);
$key = trim($key);
return $key;
}
function removeStopWords($tweet)
{
if (strlen($tweet) > 0) {
$eTweet = explode(' ', $tweet);
$stopWords = getSearchKeyStopWords();
$stopWords['#lazyweb'] = 1;
array_walk($eTweet, 'trim');
$eTweet = array_flip($eTweet);
$diff = array_diff_key($eTweet, $stopWords);
$eTweet = array_flip($diff);
$tweet = implode(' ', $eTweet);
return $tweet;
} else {
throw new InvalidArgumentException('tweet cannot be null');
}
}
