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You can download the PrestaShop code standard using SVNGit:http https://svngithub.prestashop.com/branchesPrestaShop/PrestaShop-norm/-validator (you must perform this step before going any further with this tutorial).

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1. Install PEAR: http://pear.php.net/
   $> apt-get install php-pear
2. Install PHP CodeSniffer in PEAR: http://pear.php.net/package/PHP_CodeSniffer
   $> pear install PHP_CodeSniffer
3. Add the PrestaShop standard that you downloaded from SVN earlier, and place it in PHP CodeSniffer's "Standards" folder.
   $> svn co httpgit clone https://svngithub.prestashop.com/branchesPrestaShop/PrestaShop-norm-validator / /usr/share/php/PHP/CodeSniffer/Standards/Prestashop
4. Launch PHP CodeSniffer
   $> phpcs --config-set default_standard Prestashop

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