Function is_class_keyword

src/util.rs:1861–1863

Returns `true` if `s` is one of the PHP class-keyword references: `self`, `static`, `$this`, or `parent`. Use this when you need a single guard that covers *all* class keywords, including `parent`. For the subset that resolves to the current* class only, use [`is_self_or_static`].

(s: &str)

/// keywords, including `parent`.  For the subset that resolves to the
/// *current* class only, use [`is_self_or_static`].
pub(crate) fn is_class_keyword(s: &str) -> bool {
    is_self_or_static(s) || s.eq_ignore_ascii_case("parent")
}

/// Resolve `self`, `static`, `$this`, or `parent` to a class name.
///