Description
array 
mcrypt_list_algorithms ( [string lib_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.
    
     
Example 1. mcrypt_list_algorithms() Example 
<?php     $algorithms = mcrypt_list_algorithms("/usr/local/lib/libmcrypt");
      foreach ($algorithms as $cipher) {         echo "$cipher<br />\n";     } ?>
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       The above example will produce a list with all supported
       algorithms in the "/usr/local/lib/libmcrypt" directory.
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