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http://blog.chinaunix.net/u/16928/showart_516200.html
php读取xml

parser是php内置的一个用来处理xml的解析器,它的工作由三个事件组成:起始标签、 读取数据、结束标签。

也就是说在对xml进行处理的时候每当遇到起始标签、数据和结束标签的时候函数会做相应的动作来完成对xml数据的转换。

php中对xml读取的相关函数的介绍:

引用:

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对象 XML解析函数 描述 
元素 xml_set_element_handler() 元素的开始和结束 
字符数据 xml_set_character_data_handler() 字符数据的开始 
外部实体 xml_set_external_entity_ref_handler() 外部实体出现 
未解析外部实体 xml_set_unparsed_entity_decl_handler() 未解析的外部实体出现 
处理指令 xml_set_processing_instruction_handler() 处理指令的出现 
记法声明 xml_set_notation_decl_handler() 记法声明的出现 
默认 xml_set_default_handler() 其它没有指定处理函数的事件

--------------------------------------------------------------------------------

下面就给大家举一个小小的例子用parser函数来读取xml数据:

 


$parser = xml_parser_create(); //创建一个parser编辑器

xml_set_element_handler($parser, "startElement", "endElement");//设立标签触发时的相应函数 这里分别为startElement和endElenment

xml_set_character_data_handler($parser, "characterData");//设立数据读取时的相应函数

$xml_file="1.xml";//指定所要读取的xml文件,可以是url

$filehandler = fopen($xml_file, "r");//打开文件


 


while ($data = fread($filehandler, 4096)) 
{
    xml_parse($parser, $data, feof($filehandler));
}//每次取出4096个字节进行处理


fclose($filehandler);
xml_parser_free($parser);//关闭和释放parser解析器



$name=false;
$position=false;
function startElement($parser_instance, $element_name, $attrs) //起始标签事件的函数

 {
   global $name,$position; 
   if($element_name=="NAME")
   {
   $name=true;
   $position=false;
   echo "名字:";
  }
  if($element_name=="POSITION")
   {$name=false;
   $position=true;
   echo "职位:";
  }
}

function characterData($parser_instance, $xml_data) //读取数据时的函数 

{
   global $name,$position;
   if($position)
    echo $xml_data."
";
    if($name)
     echo $xml_data."
";
}

function endElement($parser_instance, $element_name)

 //结束标签事件的函数
{
  global $name,$position; 
$name=false;
$position=false; 
}
?>

xml文件代码如下:




张三
经理



李四
助理


这个程序的结果如下:

引用:
------------------------------------------------------------------------

名字:张三 职位:经理
名字:李四 职位:助理

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