Disable rule FunctionDoubleUnderscore that seems to be bugged.

dev/codesniffer/ruleset.xml

@@ -243,6 +243,10 @@
 	</rule>
 	
 	<rule ref="PEAR.NamingConventions.ValidFunctionName" />
+
+	<rule ref="PEAR.NamingConventions.ValidFunctionName.FunctionDoubleUnderscore">
+        <severity>0</severity>
+	</rule>
 	<rule ref="PEAR.NamingConventions.ValidFunctionName.FunctionNameInvalid">
         <severity>0</severity>
 	</rule>
@@ -253,13 +257,13 @@
 	<rule ref="PEAR.NamingConventions.ValidFunctionName.FunctionNoCaptial">
         <severity>0</severity>
 	</rule>
+
 	<rule ref="PEAR.NamingConventions.ValidFunctionName.NotCamelCaps">
         <severity>0</severity>
 	</rule>
 	<rule ref="PEAR.NamingConventions.ValidFunctionName.PrivateNoUnderscore">
         <severity>0</severity>
 	</rule>
-
 	<rule ref="PEAR.NamingConventions.ValidVariableName" />
 
 	<rule ref="PEAR.WhiteSpace.ObjectOperatorIndent" />