<?php
    $noun = 'Joe';
    $verb = 'is';
    $adjective = 'awesome';
    $punctuation = '!';

    $sentence = $noun;
    $sentence .= ' ';
    $sentence .= $verb;
    $sentence .= ' ';
    $sentence .= $adjective;
    $sentence .= $punctuation;

    echo $sentence;
?>

Joe is awesome!