String operator
There are two string operators. The first is the connection operator ('.'), It returns a new string generated after the right side and left. The second is the self-connect operator ('. ='), Which is a new string that is formed in the right side of the string. See Assignment Operators for more information.
$ a = "hello";
$ b = $ a. "World!"; // Now, $ b became "Hello World!"
$ a = "hello";
$ a. = "world!"; // Now, $ A became "Hello World!"
