Fetch a result row as an associative array, a numeric array, or both
Returns an array that corresponds to the fetched row and moves the internal data pointer ahead.

Example:
MYSQL_NUM returns a numerically indexed array.
$row = mysql_fetch_array($result, MYSQL_NUM);
echo $row[0];

MYSQL_ASSOC returns an associative array.
$row = mysql_fetch_array($result, MYSQL_ASSOC);
echo $row["student_id"];

MYSQL_BOTH returns both.
$row = mysql_fetch_array($result, MYSQL_BOTH)
echo $row[0]." ".$row["name"];