an> <span class="o">=&gt;</span> <span class="s1">&#39;Doe&#39;</span>
<span class="p">);</span>
<span class="nv">$this</span><span class="o">-&gt;</span><span class="na">parser</span><span class="o">-&gt;</span><span class="na">parse_string</span><span class="p">(</span><span class="nv">$template</span><span class="p">,</span> <span class="nv">$data</span><span class="p">);</span>

<span class="c1">// Result: Hello, John Doe</span>
</pre></div>
</div>
<p>If you do not include a substitution parameter that 