$ php-56 --version PHP 5.6.26-dev (cli) (built: Aug 22 2016 18:36:51) Copyright (c) 1997-2016 The PHP Group Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies with Xdebug v2.5.0-dev, Copyright (c) 2002-2016, by Derick Rethans 

$ php-70 --version PHP 7.0.11-dev (cli) (built: Aug 20 2016 08:33:54) ( NTS ) Copyright (c) 1997-2016 The PHP Group Zend Engine v3.0.0, Copyright (c) 1998-2016 Zend Technologies with Xdebug v2.5.0-dev, Copyright (c) 2002-2016, by Derick Rethans 

$ wget https://github.com/squizlabs/PHP_CodeSniffer/releases/download/3.0.0RC1/phpcs.phar 

$ php-56 phpcs.phar Fatal error: Cannot redeclare class PHP_CodeSniffer\Standards\PEAR\Sniffs\Commenting\FileCommentSniff in phar:///home/sb/phpcs.phar/src/Standards/PEAR/Sniffs/Commenting/FileCommentSniff.php on line 2 Call Stack: 0.0031 439840 1. {main}() /home/sb/phpcs.phar:0 0.0044 605176 2. PHP_CodeSniffer\Runner->runPHPCS() /home/sb/phpcs.phar:6 0.0097 1074472 3. PHP_CodeSniffer\Runner->init() phar:///home/sb/phpcs.phar/src/Runner.php:2 0.0121 1376416 4. PHP_CodeSniffer\Ruleset->__construct() phar:///home/sb/phpcs.phar/src/Runner.php:2 0.0138 1392984 5. PHP_CodeSniffer\Ruleset->registerSniffs() phar:///home/sb/phpcs.phar/src/Ruleset.php:2 0.0155 1565152 6. PHP_CodeSniffer\Autoload::loadFile() phar:///home/sb/phpcs.phar/src/Ruleset.php:2 0.0160 1716192 7. include('phar:///home/sb/phpcs.phar/src/Standards/PEAR/Sniffs/Commenting/FileCommentSniff.php') phar:///home/sb/phpcs.phar/autoload.php:2 

$ php-70 phpcs.phar Fatal error: Cannot declare class PHP_CodeSniffer\Standards\PEAR\Sniffs\Commenting\FileCommentSniff, because the name is already in use in phar:///home/sb/phpcs.phar/src/Standards/PEAR/Sniffs/Commenting/FileCommentSniff.php on line 2 Call Stack: 0.0034 576328 1. {main}() /home/sb/phpcs.phar:0 0.0045 684240 2. PHP_CodeSniffer\Runner->runPHPCS() /home/sb/phpcs.phar:6 0.0103 966632 3. PHP_CodeSniffer\Runner->init() phar:///home/sb/phpcs.phar/src/Runner.php:2 0.0126 1156344 4. PHP_CodeSniffer\Ruleset->__construct() phar:///home/sb/phpcs.phar/src/Runner.php:2 0.0146 1166344 5. PHP_CodeSniffer\Ruleset->registerSniffs() phar:///home/sb/phpcs.phar/src/Ruleset.php:2 0.0160 1290656 6. PHP_CodeSniffer\Autoload::loadFile() phar:///home/sb/phpcs.phar/src/Ruleset.php:2 0.0166 1378240 7. include('phar:///home/sb/phpcs.phar/src/Standards/PEAR/Sniffs/Commenting/FileCommentSniff.php') phar:///home/sb/phpcs.phar/autoload.php:2