Compatibility Note

Infection requires PHP 7.1+, Xdebug or phpdbg enabled.


Phar distribution is the best and recommended way of installing Infection on your computer.

Download the latest infection.phar and infection.phar.asc:


chmod +x infection.phar

The PHAR is signed with a GPG private key. In order to verify whether the PHAR file was signed by Infection team, execute the following:

gpg --keyserver --recv-keys 493B4AA0
gpg --with-fingerprint --verify infection.phar.asc infection.phar

You should see something like:

gpg: Signature made Sun Aug  5 21:46:42 2018 +03
gpg: using RSA key XYZ
gpg: Good signature from "Infection PHP <>" [ultimate]
Primary key fingerprint: C6D7 6C32 9EBA DE2F B9C4 58CF C509 5986 493B 4AA0

Make sure fingerprint is equal to C6D7 6C32 9EBA DE2F B9C4 58CF C509 5986 493B 4AA0.

Additionally, it can be copied to /usr/local/bin to make it available globally in the terminal:

mv infection.phar /usr/local/bin/infection

# and then run just like


Updating the Phar file

Nice advantage of Phar distribution is that it has a command to update itself

./infection.phar self-update

Read more about self-update command here


Infection can also be installed by Phive - The PHAR Installation and Verification Environment.

phive install infection


You can install it globally as any other general purpose tool:

composer global require infection/infection

Do not forget to include it to ~/.bash_profile (or ~/.bashrc)!

export PATH=~/.composer/vendor/bin:$PATH

After that, you will be able to run Infection from project root:

# cd /path/to/project/root

infection --threads=4


This installation type is suitable for Infection development purposes or as a quickest (but not the best) way to try it locally for your project.

git clone
cd infection
composer install

Runnable infection command will be available at bin/infection. Assuming that you have installed Infection to ~/infection, you can run mutation testing for you project in such way:

# cd /path/to/project/root



Infection can be installed through Homebrew

brew tap infection/homebrew-infection
brew install infection

Homebrew automatically links the executable in the /usr/local/bin directory so that it is available globally.
You can then run Infection from project root:


Tap repository: