<?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; echo hash_hmac('sha256', 'Foo data', 0).PHP_EOL;
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Value for `_results` contains invalid data `array`