Question

 $query = "SELECT * FROM table WHERE data = '$userinput'";
 $row = mysql_query($query);

   while ($row = mysql_fetch_array($row))
    {
         echo $row['data'];
    }

Ok So my questions are:

1. What exactly does mysql_fetch_array return?
2. AND if my WHERE clause finds multiple matches, shouldn’t the loop execute numerous times?

I am running a program and I can only get the first result to print

Answer 1

You’re overwriting $row. Instead use a different variable for the query result.

$query = "SELECT * FROM table WHERE data = '$userinput'";
$result = mysql_query($query);

while ($row = mysql_fetch_array($result))
{
    echo $row['data'];
}