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<!DOCTYPE html>
<html lang="en">
<head>
<title>PHP String Operators</title>
</head>
<body>
<?php
$x = "Hello";
$y = " World!";
echo $x . $y; // Outputs: Hello World!
echo "<br>";
$x .= $y;
echo $x; // Outputs: Hello World!
?>
</body>
</html>
