PHP通过DOM解析XML文件或者xml字符串

上一篇记录了php创建xml文档的过程，这篇将记录如何把接受到的xml字符串中的数据和属性值解析出来，以便进一步对数据进行处理。

xml文件

<?xml version="1.0" encoding="utf-8"?>
<data>
<time value="2011-08-01"/>
<time value="2011-08-02"/>
<time value="2011-08-03">
<worker name="test1" id="14">
<hour pid="6" pmid="3"><![CDATA[spot411]]></hour>
<hour pid="6" pmid="3"><![CDATA[spot411]]></hour>
</worker>
</time>
<time value="2011-08-04">
<worker name="test2" id="6">
<hour pid="9" pmid="4"><![CDATA[Pmlal]]></hour>
<hour pid="9" pmid="4"><![CDATA[Pmlal]]></hour>
<hour pid="9" pmid="4"><![CDATA[Pmlal]]></hour>
<hour pid="9" pmid="4"><![CDATA[Pmlal]]></hour>
<hour pid="9" pmid="4"><![CDATA[Pmlal]]></hour>
<hour pid="9" pmid="4"><![CDATA[Pmlal]]></hour>
</worker>
</time>
<time value="2011-08-05">
<worker name="test3" id="1">
<hour pid="1" pmid="1"><![CDATA[Teasavant]]></hour>
<hour pid="1" pmid="1"><![CDATA[Teasavant]]></hour>
<hour pid="1" pmid="1"><![CDATA[Teasavant]]></hour>
</worker>
<worker name="tony" id="2">
<hour pid="1" pmid="1"><![CDATA[Teasavant]]></hour>
<hour pid="1" pmid="1"><![CDATA[Teasavant]]></hour>
<hour pid="1" pmid="1"><![CDATA[Teasavant]]></hour>
<hour pid="1" pmid="1"><![CDATA[Teasavant]]></hour>
<hour pid="1" pmid="1"><![CDATA[Teasavant]]></hour>
</worker>
<worker name="test4" id="4">
<hour pid="3" pmid="3"><![CDATA[Red8interactive]]></hour>
<hour pid="3" pmid="3"><![CDATA[Red8interactive]]></hour>
<hour pid="3" pmid="3"><![CDATA[Red8interactive]]></hour>
<hour pid="3" pmid="3"><![CDATA[Red8interactive]]></hour>
<hour pid="3" pmid="3"><![CDATA[Red8interactive]]></hour>
<hour pid="3" pmid="3"><![CDATA[Red8interactive]]></hour>
<hour pid="3" pmid="3"><![CDATA[Red8interactive]]></hour>
<hour pid="3" pmid="3"><![CDATA[Red8interactive]]></hour>
</worker>
</time>
<time value="2011-08-06"/>
<time value="2011-08-07"/>
</data>

 $xml = new DOMDocument();

        //$xml->load("timeline.xml");
        $xmlstring = '<data><time value="2011-08-01"/><time value="2011-08-02"/><time value="2011-08-03"><worker name="test1" id="14"><hour pid="6" pmid="3">spot411</hour><hour pid="6" pmid="3">spot411</hour></worker></time><time value="2011-08-04"><worker name="test2" id="6"><hour pid="9" pmid="4">Pmlal</hour><hour pid="9" pmid="4">Pmlal</hour><hour pid="9" pmid="4">Pmlal</hour><hour pid="9" pmid="4">Pmlal</hour><hour pid="9" pmid="4">Pmlal</hour><hour pid="9" pmid="4">Pmlal</hour></worker></time><time value="2011-08-05"><worker name="test3" id="1"><hour pid="1" pmid="1">Teasavant</hour><hour pid="1" pmid="1">Teasavant</hour><hour pid="1" pmid="1">Teasavant</hour></worker><worker name="test4" id="2"><hour pid="1" pmid="1">Teasavant</hour><hour pid="1" pmid="1">Teasavant</hour><hour pid="1" pmid="1">Teasavant</hour><hour pid="1" pmid="1">Teasavant</hour><hour pid="1" pmid="1">Teasavant</hour></worker><worker name="test5" id="4"><hour pid="3" pmid="3">Red8interactive</hour><hour pid="3" pmid="3">Red8interactive</hour><hour pid="3" pmid="3">Red8interactive</hour><hour pid="3" pmid="3">Red8interactive</hour><hour pid="3" pmid="3">Red8interactive</hour><hour pid="3" pmid="3">Red8interactive</hour><hour pid="3" pmid="3">Red8interactive</hour><hour pid="3" pmid="3">Red8interactive</hour></worker></time><time value="2011-08-06"/><time value="2011-08-07"/></data>';
        $xml->loadXML($xmlstring);

        $timedom = $xml->getElementsByTagName("time");
        $d_array = array();
        foreach ($timedom as $times){
            $time_att_value = $times->getAttribute("value");
            echo $time_att_value."<br>";
            $d_worker = $times->getElementsByTagName("worker");
            foreach ($d_worker as $d_work){
                $worker_att_id = $d_work->getAttribute("id");
                $worker_att_name = $d_work->getAttribute("name");
                echo $worker_att_name."<br>";
                //echo $worker_att_id."<br>";
                $d_hours = $d_work->getElementsByTagName("hour");
                foreach ($d_hours as $d_hour){
                    $hour_att_pid = $d_hour->getAttribute("pid");
                    $hour_att_pmid = $d_hour->getAttribute("pmid");

                    echo count($d_hour);
                    echo $d_hour->nodeValue."<br>";
                }
            }
        }

如果是xml文件，则用

$xml->load("timeline.xml");

如果是解析xml字符串则用

$xml->loadXML($xmlstring);

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获得节点属性：getAttribute('id');
获得节点值：nodeValue;