在循环中重复SQL insert语句直到id具有一定的值？

<?php
include ("db.php");

$id2 = "SELECT MAX(id) FROM osalejad;";
$id = $conn->query($id2);
if (id<= 8){
    while($id<= 7) {
        $min = 1;
        $max = 20;
        $suvanumber = rand($min, $max);
        $bar = (string) $suvanumber;
        $prii= "vaba2" . $bar;

        $sql="INSERT INTO osalejad (name) VALUES ('$prii')";
        $result = $conn->query($sql);
        if (!$result) {
            die('Invalid query: ' . mysql_error());
        }
    }
}
else {
    echo '8 osalejat on juba kirjas';
}

?> 

I have a question, i want to insert data into MYSQl table, word with a random number, but problem is, it never work as it should - if i have 3 records in name column, then till, it adds 8 more records, instead of 5 records. Is something outside of scope atm?

I will use the DB in this code.

<?php


include("db.php");  

$sql = "SELECT * FROM `osalejad`;";
$result = $conn->query($sql);
$var = array();

if ($result->num_rows > 0) {
    // output data of each row
    while ($row = mysqli_fetch_array($result)) {
        $var[] = $row["name"];
    }
} else {
   /// echo "0 results";
}


//shuffle the array, and encode into json.
shuffle($var);
$brack=json_encode($var);
$testbrack= json_encode(array_chunk($var,2));


$final = '{';
$final .= '"teams":';
$final .= $testbrack;
$final .= ',"results":[[[[0,0],[null,null]],[[null,null],[null,null]]]]}';
//updating last tournament bracket.
$sql1 = "UPDATE lan_brackets SET json='$final' ORDER BY tid DESC LIMIT 1;";

$roundOne=$conn->query($sql1);


?>