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<?php $hmac = hash_hmac("sha1", 'abcdefg', '#0123455'); var_export($hmac); var_export(sprintf("%1.1s%20.20s", '0', $hmac));
Output for git.master, git.master_jit, rfc.property-hooks
'fecf3e2a240b92a7d7eec46e8eec829d247a4abb''0fecf3e2a240b92a7d7ee'

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