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find 4 records in database and check if exist in other table

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I am sitting here and twisting my head for a mysql query that need select 4 records with a catogory and needs check that 4 records in an other table for an userid to check if a message have been send to a customer already if it have been I need to run the query again :

$result=mysqli_query($conn, "Select * from messages where approved='1' AND 
catogory='".$catogory."' ORDER by rand() LIMIT 4");

        $result=mysqli_query($conn, "select * from send_messages where 
message_id='".$id."' AND username='".$username."'");
        if($rowcount > "0"){
            header("location: index.php?username=$username");
echo "<input type='radio' id='test' name='message' value='$row[id]'><label for='test'>$row[message]</label><br>";
    echo "</form>";

The code works good for 1 record but I need to print the 4 records out and then I try this code it shows nothing

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somebody else will tell you not to use mysqli 

for the sql statement you could use a join and only have one statement

select * from messages m join send_messages sm on m.id=sm.message_id and m.username=sm.username where m.catogory='".$catogory."' and m.approved=1 order by rand() limit 4

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