PHP friends data display....?

I'm struggling with this for hours so please help me. my tables detail as

 +--------------+
 | friendstable |
 +--------------+
 | + user_id    |
 | + friends_id |
 +--------------+
 

 +--------------+
 | table2       |
 +--------------+
 | + id         |
 | + comments   |
 | + user_id    |
 +--------------+
 

i want to display friends comments only

Please guide....

thanks

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