Summary of common methods for reading XML in php_php tips

This article mainly introduces the common methods of reading XML in PHP, and summarizes the relevant operating skills of PHP in reading XML files based on DOMDocument, simplexml, regular and xmlreader in the form of examples. Friends in need can refer to the following

xml source file

<?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)DOMDocumentRead xml

<?php
   $doc = new DOMDocument();
   $doc->load(&#39;person.xml&#39;); //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)simplexmlRead xml

<?php
   $xml_array=simplexml_load_file(&#39;person.xml&#39;); //将XML中的数据,读取到数组对象中
   foreach($xml_array as $tmp){
     echo $tmp->name."-".$tmp->sex."-".$tmp->old."<br>";
   }
?>

3)Use phpregular expressionTo read data

<?php
   $xml = "";
   $f = fopen(&#39;person.xml&#39;, &#39;r&#39;);
   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)xmlreaderTo read xml data

<?php
   $reader = new XMLReader();
   $reader->open(&#39;person.xml&#39;); //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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