class LanguageNoneSniff

class LanguageNoneSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_OPEN_SQUARE_BRACKET,
            T_OPEN_SHORT_ARRAY,
        ];
    }
    
    //end register()
    
    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the function
     *                                               name in the stack.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $sequence = $phpcsFile->getTokensAsString($stackPtr, 3);
        if ($sequence === "['und']" || $sequence === '["und"]') {
            $warning = "Are you accessing field values here? Then you should use LANGUAGE_NONE instead of 'und'";
            $phpcsFile->addWarning($warning, $stackPtr + 1, 'Und');
        }
    }
    
    //end process()

}