1.foreach的格式文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24996.htmlforeach (array_expression as $value) statementforeach (array_expression as $key => $value) statement
2.foreach对数组的遍历文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24996.html
a.方式一：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24996.html$arr = array(1, 2, 3, 4,7,8,9,10,11);
foreach($arr as $a)
{ echo $a,'<br/>';//1 2 3 4 5 6 7 8 9 10 11}
b.方式二：文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24996.html
$arr = array(1, 2, 3, 4,7,8,9,10,11);
foreach($arr as $a => $v){
echo 'key',$a,'== value',$v,'<br/>';}
// key0== value1// key1== value2// key2== value3// key3== value4// key4== value7// key5== value8// key6== value9// key7== value10// key8== value11
3.foreach对对象的遍历文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24996.html
遍历对象，其实就是指将对象中的所有属性（公有属性）以键值对的形式取出并进行访问。文章源自菜鸟学院-https://www.cainiaoxueyuan.com/ymba/24996.html//定义类class Man{
public $name = 'LiLei';
public $height = 178;
public $weight = 140;
protected $age = 30;
private $money = 1000;}//实例化 $m = new Man();
//遍历
foreach($m as $k => $v)
{
echo $k . ' : ' . $v . '<br/>'; //$k为属性名，$v为属性值 }
/* name : LiLei height : 178 weight : 140 */