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@ 2016-04-20T23:59:35Z

<?php

echo hash_hmac('sha256', 'Foo data', 'secret_key').PHP_EOL;
echo hash_hmac('sha256', 'Foo data', '').PHP_EOL;
echo hash_hmac('sha256', 'Foo data', null).PHP_EOL;

Output
Performance
VLD
References
Branches

hash_hmac: documentation ( source)

preferences:dark modelive previewkey bindings

103.99 ms | 1677 KiB | 5 Q