Question

这是xml文件：

<item>
<title>TITLE</title>
<link>
http://www.website.com/#!/1234
</link>
<g:id xmlns:g="http://base.google.com/ns/1.0">**this is what I need**</g:id>
<g:price xmlns:g="http://base.google.com/ns/1.0">100 USD</g:price>
<description>
description text
</description>
</item>    <item>
<title>TITLE</title>
<link>
http://www.website.com/#!/0987
</link>
<g:id xmlns:g="http://base.google.com/ns/1.0">this is what I don't need</g:id>
<g:price xmlns:g="http://base.google.com/ns/1.0">100 USD</g:price>
<description>
description text
</description>
</item>

如何获取g：id的值，其中link为http://www.website.com/#!/1234

谢谢！

这是我用来捕捉的代码：

$xml = new SimpleXMLElement($link);
foreach ($xml as $value){
  if($value['link']=="http://www.website.com/#!/1234"){
    echo $value['g:id'];
  }
}

Answer 1

下一代码搜索g:id的值link是“http://www.website.com/#!/1234”（当找到值时显示）：

<?php
$data = <<<BLOCK
<item>
<title>TITLE</title>
<link>
http://www.website.com/#!/1234
</link>
<g:id xmlns:g="http://base.google.com/ns/1.0">**this is what I need**</g:id>
<g:price xmlns:g="http://base.google.com/ns/1.0">100 USD</g:price>
<description>
description text
</description>
<item>    </item>
<title>TITLE</title>
<link>
http://www.website.com/#!/0987
</link>
<g:id xmlns:g="http://base.google.com/ns/1.0">this is what I don't need</g:id>
<g:price xmlns:g="http://base.google.com/ns/1.0">100 USD</g:price>
<description>
description text
</description>
</item>
BLOCK;

$parser = xml_parser_create();
xml_parse_into_struct( $parser, $data, $vals, $index );
xml_parser_free( $parser );
$next = false; // THIS VARIABLE IS VERY IMPORTANT. THE FOREACH VISITS EACH
               // TAG, ONE BY ONE, SO, WHEN THE "LINK" TAG IS READ, IT'S
               // NECESSARY TO WAIT FOR THE NEXT LOOP OF THE FOREACH. WHEN
               // $NEXT==TRUE, MEANS THAT "http://www.website.com/#!/1234"
               // WAS FOUND, SO THE TAG "G:ID" IS THE ONE WE ARE LOOKING FOR.
foreach ( $vals as $item ) // VISIT EACH TAG IN XML DATA (TITLE,LINK,G:ID,...)
{ // CHECK IF CURRENT TAG'S VALUE IS "http://www.website.com/#!/1234".
  // STR_REPLACE IS USED BECAUSE "LINK" TAG TAKES THREE LINES AND ITS VALUE
  // CONTAINS LINE BREAKS.
  if ( strcasecmp( str_replace( array("\r","\n"),'',$item[ "value" ] ),
                   "http://www.website.com/#!/1234" ) == 0 )
     $next = true;
  if ( $next &&
       ( strcasecmp( $item[ "tag" ],"g:id" ) == 0 ) )
     { echo $item[ "value" ];
       break;
     }
}
?>

刚刚更正了XML数据中的错误：标记</item> <item>错误并且混淆了XML解析器，因此我将其替换为<item> </item>（在您问题中的XML数据中间）。

如果先前有更改，如果搜索到值“http://www.website.com/#!/0987”，则会显示“这是我不需要的”。

使用PHP

1 个答案: