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[EDIT] FILE: Sniff.php

<?php
/**
 * Represents a PHP_CodeSniffer sniff for sniffing coding standards.
 *
 * A sniff registers what token types it wishes to listen for, then, when
 * PHP_CodeSniffer encounters that token, the sniff is invoked and passed
 * information about where the token was found in the stack, and the
 * PHP_CodeSniffer file in which the token was found.
 *
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @copyright 2006-2015 Squiz Pty Ltd (ABN 77 084 670 600)
 * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Sniffs;

use PHP_CodeSniffer\Files\File;

interface Sniff
{

/**
     * Registers the tokens that this sniff wants to listen for.
     *
     * An example return value for a sniff that wants to listen for whitespace
     * and any comments would be:
     *
     * <code>
     *    return array(
     *        T_WHITESPACE,
     *        T_DOC_COMMENT,
     *        T_COMMENT,
     *    );
     * </code>
     *
     * @return array<int|string>
     * @see    Tokens.php
     */
    public function register();

/**
     * Called when one of the token types that this sniff is listening for
     * is found.
     *
     * The stackPtr variable indicates where in the stack the token was found.
     * A sniff can acquire information about this token, along with all the other
     * tokens within the stack by first acquiring the token stack:
     *
     * <code>
     *    $tokens = $phpcsFile->getTokens();
     *    echo 'Encountered a '.$tokens[$stackPtr]['type'].' token';
     *    echo 'token information: ';
     *    print_r($tokens[$stackPtr]);
     * </code>
     *
     * If the sniff discovers an anomaly in the code, they can raise an error
     * by calling addError() on the \PHP_CodeSniffer\Files\File object, specifying an error
     * message and the position of the offending token:
     *
     * <code>
     *    $phpcsFile->addError('Encountered an error', $stackPtr);
     * </code>
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The PHP_CodeSniffer file where the
     *                                               token was found.
     * @param int                         $stackPtr  The position in the PHP_CodeSniffer
     *                                               file's token stack where the token
     *                                               was found.
     *
     * @return void|int Optionally returns a stack pointer. The sniff will not be
     *                  called again on the current file until the returned stack
     *                  pointer is reached. Return `$phpcsFile->numTokens` to skip
     *                  the rest of the file.
     */
    public function process(File $phpcsFile, $stackPtr);

}//end interface

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