[Magento] Notice: Use of undefined constant MCRYPT_BLOWFISH

Reference: http://www.madcapsule.com/blog/index.php/php-mcrypt-magento-error

Actually, this problem may be occurred when you lost the file – libmcrypt.dll
Magento needs this file for credit card transaction and backend admin/Paypal Accounts settings.

What you need to do is to download the file from
http://files.edin.dk/php/win32/mcrypt/libmcrypt.dll

Make sure your php.ini has unmarked this line
extension=php_mcrypt.dll

and copy this file into C:WindowsSystem32

After that, restart your Apache service, then the problem will be solved.

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