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<?php $arr = ['insert' => 0, 'delete' => 0]; $arr_str = json_encode($arr); $encoded = base64url_encode($arr_str); function base64url_encode($data) { return rtrim(strtr(base64_encode($data), '+/', '-_'), '='); } function base64url_decode($data) { return base64_decode(str_pad(strtr($data, '-_', '+/'), strlen($data) % 4, '=', STR_PAD_RIGHT)); } var_dump($arr, $arr_str, $encoded, base64url_decode($encoded));
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.34, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(2) { ["insert"]=> int(0) ["delete"]=> int(0) } string(23) "{"insert":0,"delete":0}" string(31) "eyJpbnNlcnQiOjAsImRlbGV0ZSI6MH0" string(23) "{"insert":0,"delete":0}"

preferences:
199.96 ms | 404 KiB | 296 Q