(PHP 4 >= 4.0.2, PHP 5)
mcrypt_list_modes — Gets an array of all supported modes
$lib_dir = ini_get("mcrypt.modes_dir")
  ] )
   Gets the list of all supported modes in the
   lib_dir parameter.
  
lib_dirSpecifies the directory where all modes are located. If not specified, the value of the mcrypt.modes_dir php.ini directive is used.
Returns an array with all the supported modes.
Example #1 mcrypt_list_modes() Example
<?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).