本文实例讲述了php读取XML的常见方法。分享给大家供大家参考，具体如下：
xml源文件
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<?xml version="1.0 encoding="UTF-8"?>
<humans>
<zhangying>
<name>张映</name>
<sex>男</sex>
<old>28</old>
</zhangying>
<tank>
<name>tank</name>
<sex>男</sex>
<old>28</old>
</tank>
</humans>
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1)DOMDocument读取xml
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<?php
$doc = new DOMDocument();
$doc->load('person.xml'); //读取xml文件
$humans = $doc->getElementsByTagName( "humans" ); //取得humans标签的对象数组
foreach( $humans as $human )
{
$names = $human->getElementsByTagName( "name" ); //取得name的标签的对象数组
$name = $names->item(0)->nodeValue; //取得node中的值，如<name> </name>
$sexs = $human->getElementsByTagName( "sex" );
$sex = $sexs->item(0)->nodeValue;
$olds = $human->getElementsByTagName( "old" );
$old = $olds->item(0)->nodeValue;
echo "$name - $sex - $old\n";
}
?>
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2)simplexml读取xml
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<?php
$xml_array=simplexml_load_file('person.xml'); //将XML中的数据,读取到数组对象中
foreach($xml_array as $tmp){
echo $tmp->name."-".$tmp->sex."-".$tmp->old."<br>";
}
?>
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3)用php正则表达式来读取数据
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<?php
$xml = "";
$f = fopen('person.xml', 'r');
while( $data = fread( $f, 4096 ) ) {
$xml .= $data;
}
fclose( $f );
// 上面读取数据
preg_match_all( "/\<humans\>(.*?)\<\/humans\>/s", $xml, $humans ); //匹配最外层标签里面的内容
foreach( $humans[1] as $k=>$human )
{
preg_match_all( "/\<name\>(.*?)\<\/name\>/", $human, $name ); //匹配出名字
preg_match_all( "/\<sex\>(.*?)\<\/sex\>/", $human, $sex ); //匹配出性别
preg_match_all( "/\<old\>(.*?)\<\/old\>/", $human, $old ); //匹配出年龄
}
foreach($name[1] as $key=>$val){
echo $val." - ".$sex[$key][1]." - ".$old[$key][1]."<br>" ;
}
?>
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4)xmlreader来读取xml数据
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<?php
$reader = new XMLReader();
$reader->open('person.xml'); //读取xml数据
$i=1;
while ($reader->read()) { //是否读取
if ($reader->nodeType == XMLReader::TEXT) { //判断node类型
if($i%3) {
echo $reader->value; //取得node的值
} else {
echo $reader->value."<br>" ;
}
$i++;
}
}
?>
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希望本文所述对大家PHP程序设计有所帮助。