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<?php $str = "AWS-HMAC-SHA256 Credential=eyJhbGciOiJIUzI1NiIsIngtc3MiOjEy/20160911/cn/user-service/request,SignedHeaders=host;x-aws-date, Signature=d9ee2d43f2067e4b8857f15fa8fff27820051d95a4ec31e93be866f201e0797a"; sscanf($str, 'AWS-HMAC-SHA256 Credential=%[^,],SignedHeaders=%[^,], Signature=%[^,]', $credentials, $headers, $signature); var_dump($credentials, $headers, $signature);
Output for 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
string(65) "eyJhbGciOiJIUzI1NiIsIngtc3MiOjEy/20160911/cn/user-service/request" string(15) "host;x-aws-date" string(64) "d9ee2d43f2067e4b8857f15fa8fff27820051d95a4ec31e93be866f201e0797a"

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