do... while语句将始终执行的代码块一次,然后检查的条件,并重复循环,而条件是真实的。
语法
do
{
code to be executed;
}
while (condition);
例如
下面的例子定义了一个循环,开始与i = 1。然后它将增加1我和写一些输出。然后,条件是检查,循环将继续运行像我只要小于或等于5:
$i=1;
do
{
$i++;
echo "The number is " . $i . "
";
}
while ($i
?>
/* example 1 */
$i = 1;
while ($i
echo $i++; /* the printed value would be
$i before the increment
(post-increment) */
}
/* example 2 */
$i = 1;
while ($i
echo $i;
$i++;
endwhile;
?>
$q1 = 'some query on a set of tables';
$q2 = 'similar query on a another set of tables';
if ( ($r1=mysql_query($q1)) && ($r2=mysql_query($q2)) ) {
while (($row=mysql_fetch_assoc($r1))||($row=mysql_fetch_assoc($r2))) {
/* do something with $row coming from $r1 and $r2 */
}
}
?>