PHP4 User Manual: Operator-string operator

The manual TABLEborder0cellPadding0cellSpacing0height & quot; 100% & quot; width & quot; 100% & quot; & gt; has 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. More Information Manual

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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 Assignment Operators.

$ A = "Hello ";
$ B = $ a. "World! "; // Now, $ B is" Hello World! "

$ A = "Hello ";
$ A. = "World! "; // Now, $ a is" Hello World! "