<?php
$modes = mcrypt_list_modes();
foreach ($modes as $mode) {
echo "$mode <br />\n";
}
?>
The example above will produce a list with all supported
algorithms in the default mode directory. If it is not set
with the mcrypt.modes_dir php.ini
directive, the default directory of mcrypt is used (which
is /usr/local/lib/libmcrypt).