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Concatenation

Concatenation operator concatenate right and left arguments.

$a = "a"; 
$b = "b";

echo $a . $b; // ab
(1/3)

Assignment

Unlike many other languages (+ in Java). PHP has a special operation that can be used to concatenate two strings. Dot appends the argument on the right side to the argument on the left side.

$a = "a";
$b = "b";

echo $a .= $b; // ab
(2/3)

Conversion first

It is important to remember that this is the only way. Using the + operator (like in Java) will result in the two strings being first converted. The two strings converted to numeric values, and then added together.

$a = "a";
$b = "b";

echo $a += $b; // 0

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