class FunctionDeclarationSniff

class FunctionDeclarationSniff implements Sniff {
    
    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register() {
        return [
            T_FUNCTION,
        ];
    }
    
    //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 current token
     *                                               in the stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, $stackPtr) {
        $tokens = $phpcsFile->getTokens();
        if ($tokens[$stackPtr + 1]['content'] !== ' ') {
            $error = 'Expected exactly one space after the function keyword';
            $phpcsFile->addError($error, $stackPtr + 1, 'SpaceAfter');
        }
        if (isset($tokens[$stackPtr + 3]) === true && $tokens[$stackPtr + 3]['code'] === T_WHITESPACE) {
            $error = 'Space before opening parenthesis of function definition prohibited';
            $phpcsFile->addError($error, $stackPtr + 3, 'SpaceBeforeParenthesis');
        }
    }
    
    //end process()

}