php7cc is a command line tool designed to make migration from PHP 5.3-5.6 to PHP 7 easier. It searches for potentially troublesome statements in existing code and generates reports containing file names, line numbers and short problem descriptions. It does not automatically fix code to work with the new PHP version.

It tries to find statements that change their behaviour or lead to fatal errors in PHP 7. A list of such statements can be found in php-src repository. php7cc is a work in progress, so not all of them are detected at the time of writing.

To run php7cc, you need php installed, minimum required version is 5.3.3. Required version also depends on the code you are going to check: your php interpreter must support all the language features that are used in the code. For example, if traits are used somewhere in the checked code, you'll need PHP 5.4 or higher.

You also need composer to install php7cc.

The only way to install php7cc as of now is using composer:

composer create-project sstalle/php7cc php7cc --stability=dev

During the installation process, composer will ask:

Do you want to remove the existing VCS (.git, .svn..) history? 

It's better to answer "no", as it will allow updating php7cc code using git pull.

Main executable file is bin/php7cc.php. To see the full list of available options, run:

php bin/php7cc.php --help

To check a file or a directory, pass its name as the first argument. Directories are checked recursively.

So, to check a file you could run:

php bin/php7cc.php /path/to/my/file.php

To check a directory:

php bin/php7cc.php /path/to/my/directory/

When checking a directory, you can also pass a comma-separated list of file extensions that should be checked. By default, only .php files are processed.

For example, if you want to check .php, .inc and .lib files, you could run:

php bin/php7cc.php /path/to/my/directory/ php,inc,lib 

You should increase maximum function nesting level in your PHP or Xdebug config file like this:

xdebug.max_nesting_level = 1000