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mcrypt_enc_get_supported_key_sizes

Returns an array with the supported keysizes of the opened algorithm (PHP 4 >= 4.0.2, PHP 5)
array mcrypt_enc_get_supported_key_sizes ( resource td )

Returns an array with the key sizes supported by the algorithm specified by the encryption descriptor. If it returns an empty array then all key sizes between 1 and mcrypt_enc_get_key_size() are supported by the algorithm.

Example 1293. mcrypt_enc_get_supported_key_sizes() example

<?php
   $td
= mcrypt_module_open('rijndael-256', '', 'ecb', '');
   
var_dump(mcrypt_enc_get_supported_key_sizes($td));
?>

This will print:

array(3) {
 [0]=>
 int(16)
 [1]=>
 int(24)
 [2]=>
 int(32)
}