Specify minimum supported PHP version for CS config

This ensures consistent reporting regardless of the PHP version used to execute phpcs. It also allows removing excludes for sniffs that apply to newer syntax.

Author: jmikola

phpcs.xml.dist

@@ -14,27 +14,13 @@
     <file>tests</file>
     <file>tools</file>
 
+    <!-- Target minimum supported PHP version -->
+    <config name="php_version" value="70200"/>
+
     <!-- ****************************************** -->
     <!-- Import rules from doctrine/coding-standard -->
     <!-- ****************************************** -->
     <rule ref="Doctrine">
-        <!-- ********************************************** -->
-        <!-- Exclude sniffs that require newer PHP versions -->
-        <!-- ********************************************** -->
-
-        <!-- Requires PHP 7.3 -->
-        <exclude name="SlevomatCodingStandard.Functions.RequireTrailingCommaInCall.MissingTrailingComma" />
-
-        <!-- Requires PHP 7.4 -->
-        <exclude name="SlevomatCodingStandard.ControlStructures.RequireNullCoalesceEqualOperator" />
-
-        <!-- Requires PHP 8.0 -->
-        <exclude name="SlevomatCodingStandard.Classes.ModernClassNameReference.ClassNameReferencedViaFunctionCall" />
-        <exclude name="SlevomatCodingStandard.Classes.RequireConstructorPropertyPromotion.RequiredConstructorPropertyPromotion" />
-        <exclude name="SlevomatCodingStandard.Exceptions.RequireNonCapturingCatch.NonCapturingCatchRequired" />
-        <exclude name="SlevomatCodingStandard.TypeHints.UnionTypeHintFormat.DisallowedShortNullable" />
-
-
         <!-- *********************************** -->
         <!-- Exclude sniffs that cause BC breaks -->
         <!-- *********************************** -->