I have downloaded Code sniffer from this page (manual installation) and i have import it in my PHP storm IDE (i have included phpcs localy). Since i'm using cakephp i and namespaces are not needed i wan't to disable code sniffer for checking if class has namespaces. How do i do this?
You need to disable ClassDeclarationSniff rule. Please be aware that the side-effect will be disabling One class per file check.
Tutorial how to create your own custom coding standard you can find on https://www.jetbrains.com/help/phpstorm/2016.3/using-php-code-sniffer-tool.html in Configuring a local Code Sniffer script section.