How can the PHP script be modified to ensure the correct output is displayed?

The issue with the current PHP script is that the variable `$username` is not being properly concatenated with the string in the echo statement. To ensure the correct output is displayed, we need to concatenate the variable within double quotes. This can be achieved by using double quotes around the string and using the concatenation operator `.` to append the variable. 

<?php
$username = "John";
echo "Welcome, " . $username . "!";
?>

Keywords

PHP script modification correct output display error types

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