Install PHPCS OSX

phpcs

sudo cp /private/etc/php.ini.default /private/etc/php.ini;
sudo php /usr/lib/php/install-pear-nozlib.phar;
pear config-set php_ini /private/etc/php.ini;
pecl config-set php_ini /private/etc/php.ini;
sudo pear upgrade-all;
sudo pear install PHP_CodeSniffer;

----
nano /private/etc/php.ini;
    include_path Zeile einkommentieren & umändern in:
    
    include_path = ".:/php/includes:/usr/lib/php/pear/"
----

cd ~/Sites/myproject;
phpcs index.php;

when you say: nano /private/etc/php.ini;

the real file should be the one in /etc/, not en /private: nano /etc/php.ini;

In my case PEAR is under /usr/share/pear/
So in my php.ini i have include_path = ".:/php/includes:/usr/share/pear"

On recent versions of OS X, /etc is symlinked into /private/etc.

I was able to just run

sudo pear upgrade-all and sudo pear install PHP_CodeSniffer

and now it "just works"

localhost $ phpcs --version
PHP_CodeSniffer version 1.5.5 (stable) by Squiz (http://www.squiz.net)

Worked like a charm in MacBook Pro - Yosemite, thank you. R6.
I will add to change permissions over php.ini to be able to write.

@shadelotus command worked like a charm in El Capitan 👍

Worked like a charm in Yosemite

Awesome!

I'm on Sierra and I had to manually symlink phpcs to the phpcs bin in my Homebrew cellar (even though I installed PHP_CodeSniffer via PEAR, my PHP install was through Homebrew)