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

        public static PhpArray array_merge(params PhpArray[] arrays)
        {
            // "arrays" argument is PhpArray[] => compiler generates code converting any value to PhpArray.
            // Note, PHP does reject non-array arguments.

            if (arrays == null || arrays.Length == 0)
            {
                //PhpException.InvalidArgument("arrays", LibResources.GetString("arg:null_or_empty"));
                //return null;
                throw new ArgumentException();
            }

            var result = new PhpArray(arrays[0].Count);

            for (int i = 0; i < arrays.Length; i++)
            {
                if (arrays[i] != null)
                {
                    using (var enumerator = arrays[i].GetFastEnumerator())
                        while (enumerator.MoveNext())
                        {
                            if (enumerator.CurrentKey.IsString)
                                result[enumerator.CurrentKey] = enumerator.CurrentValue;
                            else
                                result.Add(enumerator.CurrentValue);
                        }
                }
            }

            // results is inplace deeply copied if returned to PHP code:
            //result.InplaceCopyOnReturn = true;
            return result;
        }