遍历对象

PHP 提供了一种定义对象的方法使其可以通过单元列表来遍历,例如用 foreach 语句。默认情况下,所有可见属性都将被用于遍历。

示例 #1 简单的对象遍历

<?php
class MyClass
{
public
$var1 = 'value 1';
public
$var2 = 'value 2';
public
$var3 = 'value 3';

protected
$protected = 'protected var';
private
$private = 'private var';

function
iterateVisible() {
echo
"MyClass::iterateVisible:\n";
foreach (
$this as $key => $value) {
print
"$key => $value\n";
}
}
}

$class = new MyClass();

foreach(
$class as $key => $value) {
print
"$key => $value\n";
}
echo
"\n";


$class->iterateVisible();

?>

以上示例会输出:

var1 => value 1
var2 => value 2
var3 => value 3

MyClass::iterateVisible:
var1 => value 1
var2 => value 2
var3 => value 3
protected => protected var
private => private var

如上所示,foreach 遍历了所有其能够访问的可见属性。

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