Explaination of While Loop Using mysql_fetch_array()

[andykupe]

<?php
while($row = mysql_fetch_array($result)){
echo $row['name']. " - ". $row['age'];
}
?>

 

For the above code, how come there is no incrementer? Since I am assuming the loop goes down each row after an iteration, how can you get more control over the loop? For example, how could I print every other row?

 

Thanks!