Drupal alternative to PHP's strip_tags? Is there a Drupal 7 function that is equivalent to PHP strip_tags?
Drupal 7 uses strip_tags directly in plenty of places (theme.inc, common.inc, etc.).

If there was an equivalent, core would use that instead, so you can safely assume that you should use strip_tags when you need the functionality it provides, not a Drupal-specific method.