PHP中foreach遍历的不仅仅是数组

1.foreach的格式

foreach (array_expression as $value)
   statement
foreach (array_expression as $key => $value)
   statement

2.foreach对数组的遍历

a.方式一：

<?php
$arr = array(1, 2, 3, 4,7,8,9,10,11);

foreach($arr as $a)
{
    echo $a,&#39;<br/>&#39;;//1 2 3 4 5 6 7 8 9 10 11
} 
?>

b.方式二：

<?php
$arr = array(1, 2, 3, 4,7,8,9,10,11);
foreach($arr as $a => $v)
{
    echo &#39;key&#39;,$a,&#39;== value&#39;,$v,&#39;<br/>&#39;;
}
// 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

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。

//定义类
class Man{
    public $name = &#39;LiLei&#39;;
    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 . &#39; : &#39; . $v . &#39;<br/>&#39;;		//$k为属性名，$v为属性值
}
/* name : LiLei
   height : 178
   weight : 140
 */