Get an array of all supported ciphers
(PHP 4 >= 4.0.2, PHP 5)
array mcrypt_list_algorithms ( [stringlib_dir] )
mcrypt_list_algorithms() is used to get an
array of all supported algorithms in the lib_dir parameter.
mcrypt_list_algorithms() takes an optional
lib_dir parameter which specifies the directory
where all algorithms are located. If not specifies, the value of the
mcrypt.algorithms_dir php.ini directive is used.