| check_plain | includes/bootstrap.inc | Encode special characters in a plain-text string for display as HTML. |
| drupal_strlen | includes/unicode.inc | Count the amount of characters in a UTF-8 string. This is less than or
equal to the byte count. |
| drupal_substr | includes/unicode.inc | Cut off a piece of a string based on character indices and counts. Follows
the same behaviour as PHP's own substr) function. |
| l | includes/common.inc | Format an internal Drupal link. |
| t | includes/common.inc | Translate strings to the current locale. |
| theme_username | includes/theme.inc | Format a username. |
| user_access | modules/user/user.module | Determine whether the user has a given privilege. |
| variable_get | includes/bootstrap.inc | Return a persistent variable. |
