tc()

tc.php

<?php

/**
 * Add context 'custom' to your translation strings.
 *
 * @param $string
 *   A string containing the English string to translate.
 * @param $args
 *   An associative array of replacements to make after translation. Based
 *   on the first character of the key, the value is escaped and/or themed.
 *   See format_string() for details.
 * @param $options
 *   An associative array of additional options, with the following elements:
 *   - 'langcode' (defaults to the current language): The language code to
 *     translate to a language other than what is used to display the page.
 *   - 'context' (defaults to the empty context): The context the source string
 *     belongs to.
 *
 * @return
 *   The translated string.
 */
function tc($string, $args = array(), $options = array()) {
  $options['context'] = 'custom';
  return t($string, $args, $options);
}