PHP uses SAX to parse XML implementation code and problem analysis_PHP tutorial

复制代码 代码如下:

$g_books = array();
$g_elem = null;
function startElement( $parser, $name, $attrs )
{
global $g_books, $g_elem;
if ( $name == 'BOOK' ) $g_books []= array();
$g_elem = $name;
}
function endElement( $parser, $name )
{
global $g_elem;
$g_elem = null;
}
function textData( $parser, $text )
{
global $g_books, $g_elem;
if ( $g_elem == 'AUTHOR' ||
$g_elem == 'PUBLISHER' ||
$g_elem == 'TITLE' )
{
$g_books[ count( $g_books ) - 1 ][ $g_elem ] = $text;
}
}
$parser = xml_parser_create();
xml_set_element_handler( $parser, "startElement", "endElement" );
xml_set_character_data_handler( $parser, "textData" );
$f = fopen( 'books.xml', 'r' );
while( $data = fread( $f, 4096 ) )
{
xml_parse( $parser, $data );
}
xml_parser_free( $parser );
foreach( $g_books as $book )
{
echo $book['TITLE']." - ".$book['AUTHOR']." - ";
echo $book['PUBLISHER']."n";
}
?>

PHP中用SAX方式解析XML发现的问题
XML如下：
so.xml

复制代码 代码如下:

1047869
2008-08-28 14:54:51

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...(省略若干行)

xml_class.php

复制代码 代码如下:

class xml {
var $parser;
var $i =0;
var $search_result = array();
var $row = array();
var $data = array();
var $now_tag;
var $tags = array("ID", "CLASSID", "SUBCLASSID", "CLASSNAME", "TITLE", "SHORTTITLE", "AUTHOR", "PRODUCER", "SUMMARY", "CONTENT", "DATE");
function xml()
{
$this->parser = xml_parser_create();
xml_set_object($this->parser, $this);
xml_set_element_handler($this->parser, "tag_open", "tag_close");
xml_set_character_data_handler($this->parser, "cdata");
}
function parse($data)
{
xml_parse($this->parser, $data);
}
function tag_open($parser, $tag, $attributes)
{
$this->now_tag=$tag;
if($tag=='RESULT') {
$this->search_result = $attributes;
}
if($tag=='ROW') {
$this->row[$this->i] = $attributes;
}
}
function cdata($parser, $cdata)
{
if(in_array($this->now_tag, $this->tags)){
$tagname = strtolower($this->now_tag);
$this->data[$this->i][$tagname] = $cdata;
}
}
function tag_close($parser, $tag)
{
$this->now_tag="";
if($tag=='ROW') {
$this->i++;
}
}
}
?>

search.php

复制代码 代码如下:

require_once("./xml_class.php");
$xml = file_get_contents("./so.xml");
$xml_parser = new xml();
$xml_parser->parse($xml);
print_r($xml_parser);
?>

In the final result, the data in the summary is much less, and the complete summary content is never obtained. Sometimes I get garbled codes, and even after searching online for a long time, I still don’t know what is causing the problem.
Later I discovered that the problem was because xml_parser parsed XML and processed the data in the node in a loop, and only took about 300 characters in length each time (I don’t know the specific length, but I just used strlen to output about 300) , then I realized that it was because each cycle would overwrite the previous data, which would cause the problem of incomplete data.
The solution is to change $this->data[$this->i][$tagname] = $cdata; in the cdata method in the xml class in the xml_class file to $this->data[$ this->i][$tagname] .= $cdata; can be solved (there are some NOTICE errors, which PHP has ignored).

http://www.bkjia.com/PHPjc/324133.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/324133.htmlTechArticleCopy the code as follows: ?php $g_books = array(); $g_elem = null; function startElement( $parser , $name, $attrs ) { global $g_books, $g_elem; if ( $name == 'BOOK' ) $g_books []=...