How to traverse and parse xml string in php

The example in this article describes the method of php traversing and parsing xml strings. Share it with everyone for your reference, the details are as follows:

<?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[&#39;ip&#39;]} \n" ;
}
//这里经过测试,发现使用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

I hope this article will be helpful to everyone in PHP programming design.

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