How to create hmac md5 in php?

Question

I am working with payU credit card systems. But I dont manage. payU tells me that I have to create hmac md5 hashes.

My secret key is : 3~9#[X4^660?ak+]h6%T I want to

Answer 1

You can easily do that using the hash_hmac() function:

$input = 'foo';
$output = hash_hmac('md5', $input, $secretKey);

where $secretKey holds a string representation of your key.