<?php

$content = <<<XML

<?xml version="1.0" encoding="UTF-8"?>

<test>

    <global_setting>

        <ping_protocol>HTTP</ping_protocol>

        <ping_port>80</ping_port>

        <ping_path>/index.html</ping_path>

        <response_timeout>5000</response_timeout>

        <health_check_interval>3000</health_check_interval>

        <unhealthy_threshold>2</unhealthy_threshold>

        <healthy_threshold>3</healthy_threshold>

    </global_setting>

    <instances>

        <instance ip="192.168.234.121"/>

        <instance ip="192.168.234.28"/>

    </instances>

</test>

XML;

$test = new SimpleXMLElement($content);  

//获得ping_protocol的值

$ping_protocol = $test->global_setting->ping_protocol;

echo "ping_protocol : $ping_protocol \n";  

//打印出所有instance的IP

foreach ( $test->instances->instance as $instance) {

    echo "IP: {$instance['ip']} \n" ;

}  

//经过我的测试,发现试用var_dump之类的似乎不能有效输出值,用echo比较顺利,还有就是上面的那个xml的例子可以去掉<?xml version="1.0" encoding="UTF-8"?>  也可以去掉头尾///的<<<xml,然后当做普通字符串那样对待,但是没有测试中文等