generate jwt token in php

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Guilhem
22 Oct 2020
1// Create token header as a JSON string
2$header = json_encode(['typ' => 'JWT', 'alg' => 'HS256']);
3
4// Create token payload as a JSON string
5$payload = json_encode(['user_id' => 123]);
6
7// Encode Header to Base64Url String
8$base64UrlHeader = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($header));
9
10// Encode Payload to Base64Url String
11$base64UrlPayload = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($payload));
12
13// Create Signature Hash
14$signature = hash_hmac('sha256', $base64UrlHeader . "." . $base64UrlPayload, 'abC123!', true);
15
16// Encode Signature to Base64Url String
17$base64UrlSignature = str_replace(['+', '/', '='], ['-', '_', ''], base64_encode($signature));
18
19// Create JWT
20$jwt = $base64UrlHeader . "." . $base64UrlPayload . "." . $base64UrlSignature;
21
22echo $jwt;
23
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