php通过正则表达式记取数据来读取xml的方法

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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>" ;

}

?>