$co_author = Array
(
    [ID] => 129
    [user_firstname] => Anupam
    [user_lastname] => Majumdar
    [nickname] => anupam.majumdar
    [user_nicename] => anupam-majumdar-2
    [display_name] => Anupam Majumdar
    [user_email] => anupam.majumdar@accenture.com
    [user_url] => 
    [user_registered] => 2019-07-09 18:48:02
    [user_description] => 
    [user_avatar] => 
)

 $co_author = Array
(
    [ID] => 130
    [user_firstname] => Arnab
    [user_lastname] => Sinha
    [nickname] => arnab.sinha
    [user_nicename] => arnab-sinha
    [display_name] => Arnab Sinha
    [user_email] => arnab.a.sinha@accenture.com
    [user_url] => 
    [user_registered] => 2019-07-09 18:50:48
    [user_description] => 
    [user_avatar] => 
)