Combined assignment operators must be used (#22)

Author: thewilkybarkid

src/Libero/ruleset.xml

@@ -44,6 +44,7 @@
     <rule ref="SlevomatCodingStandard.Namespaces.UseDoesNotStartWithBackslash"/>
     <rule ref="SlevomatCodingStandard.Namespaces.UseFromSameNamespace"/>
     <rule ref="SlevomatCodingStandard.Namespaces.UseSpacing"/>
+    <rule ref="SlevomatCodingStandard.Operators.RequireCombinedAssignmentOperator"/>
     <rule ref="SlevomatCodingStandard.PHP.ShortList"/>
     <rule ref="SlevomatCodingStandard.PHP.TypeCast"/>
     <rule ref="SlevomatCodingStandard.TypeHints.DeclareStrictTypes">

tests/cases/php/assignment-combined

@@ -0,0 +1,19 @@
+---DESCRIPTION---
+Combined assignment operators must be used
+---CONTENTS---
+<?php
+
+declare(strict_types=1);
+
+$i = $i + 2;
+$foo = $foo . $bar;
+
+---FIXED---
+<?php
+
+declare(strict_types=1);
+
+$i += 2;
+$foo .= $bar;
+
+---