Why is the value in the following function an object?

Why is the value in the following function an object? public & nbsp; function & nbsp;-run ($ type) {& nbsp; $ type-& gt; version (); & nbsp; $ type-& gt; work ();} how can the value of a function be a function? how is the value of a function specified? ------ solution ----- Why is the value in the following function an object?

Public function-run ($ type ){
$ Type-> version ();
$ Type-> work ();
}

How can the value of a function be defined?
------ Solution ----------------------
Function parameters can be any data (of course you can limit it yourself)
In your sample code, $ type is an object.