you will use while loop to do some work continuously until some condition comes

example:

suppose you have 10 rupees and you are happy with this  money.

$r=10;

you go to some shop.pay 1 rupee to buy something..

now you have 9 rupee left.

buy some other 1 rupee

now you have 8 rupee

.

.

.

at the end you will have 0 rupee . and now you can not buy anything more.. so this is the condition of while loop that when $r==0 you must leave the shop if not continue  ......

[code]

<?php

$r=10; //you have 10 rupees

while ($r!=0)  // $r is not zero then go inside
{

echo "you have ".$r." rupee left";
echo "...buy something<br/> "; //<br/> use to new line

$r--; // minus one value from it like $r=$r- 1;
}

 echo "now you are out of while loop because r =0 now"

?>

[/code]