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PHP String Operator

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 ('.='), which appends the argument on the right side to the argument on the left side. Please read Assignment Operators for more information.

There are only two string operators in PHP: concatenation and shorthand concatenation.

Operator Name Description
. Concatenation Returns the second value appended to the first: $a . $b
.= Shorthand concatenation Appends the second value to the first: $a .= $b


				$a = "Hello ";
				$b = $a . "World!"; // now $b contains "Hello World!"

				$a = "Hello ";
				$a .= "World!";     // now $a contains "Hello World!"


				$txt1 = "Hello";
				$txt2 = " world!";
				echo $txt1 . $txt2;


				$txt1 = "Hello";
				$txt2 = " world!";
				$txt1 .= $txt2;
				echo $txt1;

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