Backticks must not be used (#21)

Author: thewilkybarkid

src/Libero/ruleset.xml

@@ -10,6 +10,7 @@
         <exclude name="PSR2.Namespaces.UseDeclaration.SpaceAfterLastUse"/>
     </rule>
 
+    <rule ref="Generic.PHP.BacktickOperator"/>
     <rule ref="Generic.PHP.LowerCaseType"/>
     <rule ref="PEAR.WhiteSpace.ObjectOperatorIndent"/>
     <rule ref="SlevomatCodingStandard.Classes.ClassConstantVisibility">

tests/cases/php/backtick

@@ -0,0 +1,13 @@
+---DESCRIPTION---
+Backticks must not be used
+---CONTENTS---
+<?php
+
+declare(strict_types=1);
+
+$list = `ls -la`;
+
+---MESSAGES---
+5:9 Generic.PHP.BacktickOperator.Found
+5:16 Generic.PHP.BacktickOperator.Found
+---