Pchp.Library.Arrays.array_filter C# (CSharp) Method

        public static PhpArray array_filter(Context ctx /*, caller*/, PhpArray array, IPhpCallable callback)
        {
            if (array == null)
            {
                //PhpException.ArgumentNull("array");
                //return null;
                throw new ArgumentNullException(nameof(array));
            }

            if (callback == null)
            {
                //PhpException.ArgumentNull("callback");
                //return null;
                throw new ArgumentNullException(nameof(callback));
            }

            var result = new PhpArray();
            var args = new PhpValue[1];

            var iterator = array.GetFastEnumerator();
            while (iterator.MoveNext())
            {
                var entry = iterator.Current;

                // no deep copying needed because it is done so in callback:
                args[0] = entry.Value;

                // adds entry to the resulting array if callback returns true:
                if (callback.Invoke(ctx, args).ToBoolean())
                {
                    result.Add(entry);
                }
            }

            // values should be inplace deeply copied:
            //result.InplaceCopyOnReturn = true;
            return result;
        }