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Foreach in PHP traverses more than just arrays

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1.Foreach format

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

2.Foreach traversal of the array

a. Method 1 :

<?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. Method 2:

<?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 traverses the object

Traverses the object , in fact, it means to take out and access all attributes (public attributes) in the object in the form of key-value pairs .

//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
 */

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