Warning: array_merge (): Argument #3 isnotanarray

The background code is written as follows: $ data [& #039; goods & #039;] array_merge ($ goods, $ cat_goods, $ all_goods); I used to upload two arrays, an error will be reported if three items are passed in. what can be done ?? I checked the manual, but the manual did not provide a solution. I hope you can give me some advice. thank you...

The background code is written in this way.
$ Data ['Goods '] = array_merge ($ goods, $ cat_goods, $ all_goods );
I used to upload two arrays. if I upload three arrays, an error is returned. what is the solution ??
I checked the manual, but the manual did not provide a solution. thank you for your advice.

Thank you! let me solve it by myself. after all, there is nothing complicated.