为什么我的行应该循环170次时循环12000次？

I am running a while/foreach on a mySQL database and an array to check if it exists or not. It's supposed to loop 170 times but it loops over 12000 times. Why is that?

$my_rows = array();
while($row = mysql_fetch_assoc($run_query)){

    $my_rows[] = $row;
    foreach($my_rows as $row){
        if(in_array_r($row['name'], $products)){
            echo "Exists";
        } else {
            echo "Does not exist";
        }
    }
}

$my_rows = array();

while($row = mysql_fetch_assoc($run_query)){

    $my_rows[] = $row;

    if(in_array_r($row['name'], $products)){

        echo "Exists";

    } else {

        echo "Does not exist";

    }

}

What should be happening here is that you assign the result of mysql_fetch_assoc to $my_rows and then loop over the contents of $my_rows. One loop. One of those loops doesn't need to exist.

$my_rows = mysql_fetch_assoc(...);
foreach($my_rows as $row){ ...do stuff here... }