There are two string operators. The first is the concatenation operator ('.'), which returns the concatenation of its right and left arguments. The second is the concatenating assignment operator ('.='). Please read Assignment Operators for more information.
1 2 $a = "Hello "; 3 $b = $a . "World!"; // now $b contains "Hello World!" 4 5 $a = "Hello "; 6 $a .= "World!"; // now $a contains "Hello World!" 7 |