PHP 7 Compatibility Checker(php7cc)
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.
What kind of problems does it detect?
There are 2 types of issues reported by php7cc:
- Errors that will definitely cause some kind of trouble (a fatal, a syntax error, a notice, etc.) on PHP 7. These are highlighted in red.
- Warnings that may or may not lead to logical errors. For example, statements that are legal in both PHP 5 and PHP 7, but change their behaviour between versions fall into this category. Warnings are highlighted in yellow.
A list of statements that may cause errors or warnings to be reported can be found in the php-src repository.
Although php7cc tries to detect as much problems as accurately as possible, sometimes 100% reliable detection is very hard to achieve. That's why you should also run a comprehensive test suite for the code you are going to migrate.
To run php7cc, you need php installed, minimum required version is 5.3.3. PHP 7 is supported, but files with syntax errors (for example, invalid numeric literals or invalid UTF-8 codepoint escape sequences) can't be processed. You will only get the warning message about the first syntax error for such files.
You may also need composer to install php7cc.
You can download a phar package for any stable version from the Github releases page.
Make sure you have composer installed. Then execute the following command:
composer global require sstalle/php7cc
It is also recommended to add
~/.composer/vendor/bin to your
This makes it possible to run php7cc by entering just the executable name.
Composer (locally, per project)
Make sure you have composer installed. Then execute the following command from your project directory:
composer require sstalle/php7cc --dev
Examples in this section assume that you have installed php7cc globally using composer
and that you have added it's vendor binaries directory to your
PATH. If this is not
the case, just substitute
php7cc with the correct path to the binary of phar package.
For local per project installation the executable will be located at
To see the full list of available options, run:
Checking a single file or directory
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:
To check a directory:
Specifying file extensions to check
When checking a directory, you can also specify 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:
php7cc --extensions=php,inc,lib /path/to/my/directory/
Excluding file or directories
You can specify a list of absolute or relative paths to exclude from checking. Relative paths are relative to the checked directories.
So, if you want to exclude vendor and test directories, you could run:
php7cc --except=vendor --except=/path/to/my/directory/test /path/to/my/directory/
In this example, directories
/path/to/my/directory/test and their contents will not be checked.
Specifying minimum issue level
If you set a minimum issue level, only issues having that or higher severity level will be
php7cc. There are 3 issue levels: "info", "warning" and "error". "info" is
reserved for future use and is the same as "warning".
php7cc --level=error /path/to/my/directory/
Only errors, but not warnings will be shown in this case.
Maximum function nesting level of 100/250/N reached, aborting!
You should increase maximum function nesting level in your PHP or Xdebug config file like this:
xdebug.max_nesting_level = 1000
Allowed memory size of N bytes exhausted
You should increase amount of memory available to CLI PHP scripts or disable PHP memory limit.
The latter can be done by setting the
memory_limit PHP option to -1. This option can be set by editing
php.ini or by passing a command-line argument to PHP executable like this:
php -d memory_limit=-1 php7cc.php /path/to/my/directory
Other useful links
Please read the contributing guidelines.
The list of contributors is available on the corresponding Github page.