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<?php $foo = null; echo serialize(['brand_user_id' => 123, 'last_login_dt' => $foo ? $foo->format('Y-m-d') : null]); print_r(unserialize('a:2:{s:13:"brand_user_id";i:123;s:13:"last_login_dt";N;}'));
Output for git.master, git.master_jit, rfc.property-hooks
a:2:{s:13:"brand_user_id";i:123;s:13:"last_login_dt";N;}Array ( [brand_user_id] => 123 [last_login_dt] => )

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