如何在php imap函数中看到看不见的电子邮件

I am trying to make a php application like email client. when i fetch a mailbox with php imap and read a message then i need to set the email flag as read. but i cannot do that. I am trying to make a php application like email client. when i fetch a mailbox with php imap and read a message then i need to set the email flag as read. but i cannot do that.I am trying to make a php application like emai