用PHP&XML编制迷你搜索引擎（二）
时间：2007-02-17 来源：PHP爱好者
三、一个最简单的用PHP显示XML的范例
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
下面的程序是将解析XML并按照树形结构输出至浏览器，并显示每层的元素总数。
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
__________________________________________________________
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
<?
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$file = "demo.xml";// XML文件
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
// 解析XML文件的函数
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
function xml_parse_from_file($parser, $file)
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{
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if(!file_exists($file))
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{
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die("Can’t find file "$file".");
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}
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if(!($fp = @fopen($file, "r")))
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{
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die("Can’t open file "$file".");
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}
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while($data = fread($fp, 4096))
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{
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if(!xml_parse($parser, $data, feof($fp)))
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{
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return(false);
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}
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}
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fclose($fp);
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return(true);
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}
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function start_element($parser, $name, $attrs)
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//遇到了开元素标记如<a href="link">就执行这一段，
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//$name=a,$attrs为一个属性数组
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{
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global $level,$levelcount,$maxlevel;
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$level += 1;
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if($level>$maxlevel)$maxlevel=$level;
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$levelcount[$level]+=1;
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echo "
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";
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for($i=1;$i<=($level-1);$i++)echo"| ";
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if($level>0)echo"+----";
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www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
echo "<font color=red>".trim($name)." </font>";
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while ( list( $key, $val ) = each( $attrs ) ) { //显示属性
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echo "<font color=green>$key => $val</font>; ";
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}
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}
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www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
function stop_element($parser, $name)
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//遇到了开元素标记如</body>就执行这一段，
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{
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global $level;
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$level -= 1;
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}
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function data($parser, $data)
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
{
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global $level;
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if(trim($data)!=""){
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echo trim($data);
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}
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}
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function showcount() //显示每一层的元素总数
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{
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global $maxlevel,$levelcount;
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echo "
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";
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for ($i=0;$i<=$maxlevel;$i++){
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echo $levelcount[$i]." ";
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}
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}
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global $level,$levelcount,$maxlevel;
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$level = -1;
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// 产生解析器的实例
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$parser = xml_parser_create();
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// 设置处理函数
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xml_set_element_handler($parser, "start_element", "stop_element");
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xml_set_character_data_handler($parser, "data");
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xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
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// 解析文件
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$ret = xml_parse_from_file($parser, $file);
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if(!$ret)
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{
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die(sprintf("XML error: %s at line %d",
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xml_error_string(xml_get_error_code($parser)),
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xml_get_current_line_number($parser)));
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}
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// 释放解析器
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xml_parser_free($parser);
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showcount();
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?>
php爱好者站 http://www.ｐｈｐｆａｎｓ.net 为phper提供一切资讯.
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
下面的程序是将解析XML并按照树形结构输出至浏览器，并显示每层的元素总数。
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
__________________________________________________________
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
<?
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
$file = "demo.xml";// XML文件
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
// 解析XML文件的函数
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
function xml_parse_from_file($parser, $file)
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{
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if(!file_exists($file))
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{
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die("Can’t find file "$file".");
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}
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if(!($fp = @fopen($file, "r")))
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{
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die("Can’t open file "$file".");
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}
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while($data = fread($fp, 4096))
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{
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if(!xml_parse($parser, $data, feof($fp)))
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{
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return(false);
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}
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}
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fclose($fp);
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return(true);
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}
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function start_element($parser, $name, $attrs)
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//遇到了开元素标记如<a href="link">就执行这一段，
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
//$name=a,$attrs为一个属性数组
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{
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global $level,$levelcount,$maxlevel;
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$level += 1;
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if($level>$maxlevel)$maxlevel=$level;
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$levelcount[$level]+=1;
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echo "
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";
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for($i=1;$i<=($level-1);$i++)echo"| ";
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if($level>0)echo"+----";
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echo "<font color=red>".trim($name)." </font>";
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while ( list( $key, $val ) = each( $attrs ) ) { //显示属性
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echo "<font color=green>$key => $val</font>; ";
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}
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}
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function stop_element($parser, $name)
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//遇到了开元素标记如</body>就执行这一段，
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
{
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global $level;
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$level -= 1;
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}
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function data($parser, $data)
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{
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global $level;
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if(trim($data)!=""){
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echo trim($data);
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}
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}
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function showcount() //显示每一层的元素总数
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{
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global $maxlevel,$levelcount;
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echo "
www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
";
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for ($i=0;$i<=$maxlevel;$i++){
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echo $levelcount[$i]." ";
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}
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}
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global $level,$levelcount,$maxlevel;
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$level = -1;
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www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
// 产生解析器的实例
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$parser = xml_parser_create();
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www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
// 设置处理函数
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xml_set_element_handler($parser, "start_element", "stop_element");
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xml_set_character_data_handler($parser, "data");
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xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0);
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www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
// 解析文件
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$ret = xml_parse_from_file($parser, $file);
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if(!$ret)
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{
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die(sprintf("XML error: %s at line %d",
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xml_error_string(xml_get_error_code($parser)),
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xml_get_current_line_number($parser)));
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}
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www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
// 释放解析器
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xml_parser_free($parser);
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www.chinaitpower.comA7OouqmKWY71Q9czancaDuY9b
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showcount();
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