concatenation

Script :
<?php
<br>
 <br>
$a = "Hallo ";
<br>
$b = $a . "Dunia!";
<br>
 <br>
echo $b;
<br>
 <br>
?>


Hasil :

$a = "Hallo ";
$b = $a . "Dunia!";

echo $b;

?>