Function seed_superglobals

src/completion/variable/forward_walk.rs:5011–5028

Seed PHP superglobals (`$_SERVER`, `$_GET`, `$_POST`, etc.) into the scope as `array` so that accesses on them resolve correctly. PHP makes these available in every scope without an explicit `global` declaration.

(scope: &mut ScopeState)

/// PHP makes these available in every scope without
/// an explicit `global` declaration.
fn seed_superglobals(scope: &mut ScopeState) {
    let array_type = vec![ResolvedType::from_type_string(PhpType::Named(
        "array".to_string(),
    ))];
    for name in [
        "$_SERVER",
        "$_GET",
        "$_POST",
        "$_COOKIE",
        "$_REQUEST",
        "$_FILES",
        "$_ENV",
        "$_SESSION",
        "$GLOBALS",
    ] {
        scope.set(name, array_type.clone());
    }
}

/// Recursively walk an expression tree to find function call
/// sub-expressions and seed pass-by-reference primitive types for each.