CH22,遍历所有子元素.p436---

<?phpheader("Content-Type:text/html;charset=utf-8");/*  第二种方法  注意encoding的编码和文件保存的格式相关*/$str = <<<XML<?xml version='1.0' encoding='utf-8'?><Object>    <Book>        <computerbook>PHP从入门到精通</computerbook>    </Book>    <Book>        <computerbook>php开发实录</computerbook>    </Book></Object>XML;$xml_2 = simplexml_load_string($str);foreach ($xml_2->children() as $layer_one) {    print_r($layer_one);    echo "<br/>";    foreach ($layer_one->children() as $layer_two) {        print_r($layer_two);        echo "<br/>";    }}