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<?php var_dump(serialize(array("password,refresh_token"))); var_dump(serialize(array("password","refresh_token")));
based on vI1jE
Output for 4.3.0 - 7.1.0
string(40) "a:1:{i:0;s:22:"password,refresh_token";}" string(50) "a:2:{i:0;s:8:"password";i:1;s:13:"refresh_token";}"