Using php 7 feature in example

_posts/09-02-01-Errors.md

@@ -87,7 +87,8 @@ rewritten like this:
 
 {% highlight php %}
 <?php
-echo isset($foo['bar']) ? $foo['bar'] : '';
+//Null Coalescing Operator
+echo $foo['bar'] ?? '';
 {% endhighlight %}
 
 One instance where error suppression might make sense is where `fopen()` fails to find a file to load. You could check