php-doc-en/reference/mcrypt/examples.xml

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<appendix xml:id="mcrypt.examples" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
 &reftitle.examples;
 <para>
  Mcrypt can be used to encrypt and decrypt using the above
  mentioned ciphers. If you linked against <literal>libmcrypt-2.2.x</literal>, the
  four important mcrypt commands (<function>mcrypt_cfb</function>,
  <function>mcrypt_cbc</function>, <function>mcrypt_ecb</function>,
  and <function>mcrypt_ofb</function>) can operate in both modes
  which are named <constant>MCRYPT_ENCRYPT</constant> and
  <constant>MCRYPT_DECRYPT</constant>, respectively.
  <example>
   <title>Encrypt an input value with <literal>TripleDES</literal>
    under 2.2.x in <literal>ECB</literal> mode</title>
   <programlisting role="php">
<![CDATA[
<?php
$key = "this is a secret key";
$input = "Let us meet at 9 o'clock at the secret place.";

$encrypted_data = mcrypt_ecb (MCRYPT_3DES, $key, $input, MCRYPT_ENCRYPT);
?>
]]>
   </programlisting>
  </example>
  This example will give you the encrypted data as a string in
  <literal>$encrypted_data</literal>.
 </para>
 <para>
  If you linked against libmcrypt 2.4.x or 2.5.x, these functions are still
  available, but it is recommended that you use the advanced functions.
  <example>
   <title>Encrypt an input value with <literal>TripleDES</literal> under 2.4.x and higher in <literal>ECB</literal> mode</title>
   <programlisting role="php">
<![CDATA[
<?php
    $key = "this is a secret key";
    $input = "Let us meet at 9 o'clock at the secret place.";

    $td = mcrypt_module_open('tripledes', '', 'ecb', '');
    $iv = mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
    mcrypt_generic_init($td, $key, $iv);
    $encrypted_data = mcrypt_generic($td, $input);
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);
?>
]]>
   </programlisting>
  </example>
  This example will give you the encrypted data as a string in
  <literal>$encrypted_data</literal>.  For a full example see
  <function>mcrypt_module_open</function>.
 </para>
</appendix>

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