<?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);
//獲得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" ;
}
//這里經(jīng)過測試,發(fā)現(xiàn)使用var_dump之類的似乎不能有效輸出值,用echo比較順利,
//還有就是上面的那個xml的例子可以去掉<?xml version="1.0" encoding="UTF-8"?> 
//也可以去掉頭尾///的<<<xml,然后當(dāng)做普通字符串那樣對待,但是沒有測試中文等