PHP读取XML文件的三种方式

一  用 
simplexml_load_file 读取xml文件

<?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>";
    }
?>

二 
DOMDocument读取xml

<?php
    $doc = new DOMDocument();
    $doc->load('xml.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";
    }

三 
 利用正则来获取数据

<?php
header("content-type:text/html;charset=utf-8");

$xml = '';
$f = fopen("xml.xml", "r"); 

while($data = fread($f, 2096))
{
    $xml .= $data;
}
fclose($f);  

preg_match_all('/\<humans\>(.*?)\<\/humans\>/s', $xml, $humans);  

foreach($humans[1] as $human)
{
    preg_match_all('/\<name\>(.*?)\<\/name\>/s', $human, $names);
    preg_match_all('/\<sex\>(.*?)\<\/sex\>/s', $human, $sexes);
    preg_match_all('/\<old\>(.*?)\<\/old\>/s', $human, $olds);
}  

foreach($names[1] as $k=>$name)
{
    echo $names[1][$k].'-'.$sexes[1][$k].'-'.$olds[1][$k]."\n";
}