This feature was DEPRECATED in PHP 7.1.0, and REMOVED in PHP 7.2.0.
Alternatives to this feature include:
This extension has been moved to the » PECL repository and is no longer bundled with PHP as of PHP 7.2.0.
This is an interface to the mcrypt library, which supports a wide variety of block algorithms such as DES, TripleDES, Blowfish (default), 3-WAY, SAFER-SK64, SAFER-SK128, TWOFISH, TEA, RC2 and GOST in CBC, OFB, CFB and ECB cipher modes. Additionally, it supports RC6 and IDEA which are considered "non-free". CFB/OFB are 8bit by default.