php do while

php do while 

先执行do，在判断while

源码：

<?php

$x = 1;

do {

echo "x is :<br>";

$x++;

}while($x<=5);

$y = 6;

do {

echo "y is :<br>";

$y++;

} while ($y<=5);

?>

输出：

x is 1 

x is 2 

x is 3 

x is 4 

x is 5 

y is 6