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<h1 class="title">Introduction</h1>
<div class="warning"><strong class="warning">Warning</strong>
<p class="para">
This feature was <em class="emphasis">DEPRECATED</em> in PHP 7.1.0, and
<em class="emphasis">REMOVED</em> in PHP 7.2.0.
</p>
<p class="para">
Alternatives to this feature include:
</p>
<ul class="simplelist">
<li class="member">
<a href="book.sodium.html" class="link">Sodium</a>
(available as of PHP 7.2.0)
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<li class="member">
<a href="book.openssl.html" class="link">OpenSSL</a>
</li>
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<blockquote class="note"><p><strong class="note">Note</strong>:
<p class="para">
This extension has been moved to the
<a href="http://pecl.php.net/" class="link external">» PECL</a> repository and is no longer bundled with
PHP as of PHP 7.2.0.
</p>
</p></blockquote>
<p class="para">
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.
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