function nodewords_unique_values in Nodewords: D6 Meta Tags 6

Same name and namespace in other branches

1. 6.3 nodewords.module \nodewords_unique_values()
2. 6.2 nodewords.module \nodewords_unique_values()

Remove the duplicates from a list of items separated from the separator, preserving the order in which they appear.

Parameters

$text: The string containing the list of items concatenated using $separator.

$separator: The string used to split the string into an array. A space will be appended to the string before it is used to create the string from the array of unique items found in the string passed as argument.

$max_items: The maximum number of items accepted in the returned array; the default value is -1, which means no limit.

Return value

A string containing only unique items present in the string of concatenated items.

2 calls to nodewords_unique_values()

nodewords_basic_keywords_prepare in nodewords_basic/nodewords_basic.module

Set the meta tag content.

nodewords_update_6102 in ./nodewords.install

Implements hook_update_N().

File

./nodewords.module, line 1190

Implement an API that other modules can use to implement meta tags.

Code

function nodewords_unique_values($text, $separator = ',', $max_items = -1) {
  $lc_values = array();
  $unique_values = array();
  if (empty($text)) {
    return '';
  }
  foreach (array_filter(array_map('trim', explode($separator, $text))) as $item) {
    $lowercase = drupal_strtolower($item);
    if (!in_array($lowercase, $lc_values)) {
      $lc_values[] = $lowercase;
      $unique_values[] = $item;
    }
  }
  if ($max_items > 0) {
    $unique_values = array_slice($unique_values, 0, $max_items);
  }
  return implode("{$separator}", $unique_values);
}