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
<?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>
1)domdocument读取xml
<?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"; } ?>
2)simplexml读取xml
<?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>"; } ?>
3)用php正则表达式来读取数据
<?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>" ; } ?>
4)xmlreader来读取xml数据
<?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++; } } ?>
以上就是php读取xml的四种方法实例详解的详细内容。