while
例子：
/* example 1 */
$a = 0;
while (true) {
$a++;
echo $a.'<br>';
if($a >= 10){
break; //打断循环
}
} /* example 2 */
$a = 0;
while ($a < 10) {
$a++;
echo $a.'<br>'; } /* example 3 */
$arr = array("orange", "banana", "apple", "raspberry");
$i = 0;
while ($i < count($arr)) {
$a = $arr[$i];
echo $a .",";
$i++;
} /* example 4 */
$myArray=['aa','bb','cc','dd']; while (list ($key, $val) = each ($myArray)) {
echo "$key=>$val,";
}
do-while
例子：
$a=0;
do{
$a++;
echo $a;
}
while ($a < 10);
for
例子：
/* example 1 */
for ($i = 1; $i <= 10; $i++) {
echo $i;
}
echo "<br>";
/* example 2 */
for ($i = 1; ; $i++) {
if ($i > 10) {
break;
}
echo $i;
}
echo "<br>";
/* example 3 */
$i = 1;
for (;;) {
if ($i > 10) {
break;
}
echo $i;
$i++;
}
echo "<br>";
/* example 4 */
for ($i = 1, $j = 0; $i <= 10; $j += $i, print $i, $i++);
foreach
例子：
$arr = array(1, 2, 3, 4); /* example 1 */
foreach ($arr as $value) {
echo $value.'<br>';
} /* example 2 */
foreach ($arr as $key => $val) {
echo "$key=>$val,";
}