PHP4 User Manual: Operator-string operator

A string operator has two character string operators. The first is the concatenation operator (.), which returns the new string generated after connecting the right and left. The second is the self-join operator (.), which is a new string formed by adding a string to its right. For more information, see AssignmentOperators. $ ASyntaxHighlighter. all ();

String operators
There are two string operators. The first is the concatenation operator (.), which returns the new string generated after connecting the right and left. The second is the self-join operator (. =), which is a new string formed by adding a string to its right. For more information, see fancylanguage.operators.assignment.html> Assignment Operators.
$ A = "Hello"; $ B = $ a. "World! "; // Now, $ B is" Hello World! "$ A =" Hello "; $ a. =" World! "; // Now, $ a is" Hello World! "