XML复杂的分析

Question

可能重复：
distinct in Xpath?

我想从使用PHP我的XML文件中提取数据。我想根据我的XML文件中的WebCategory得到唯一的ProductRange。但是下面编写的PHP代码会生成重复/重复的结果。我不知道我在哪里犯错！下面是代码：

XML代码：

<?xml version="1.0" standalone="yes"?> 
<Rows> 
<Row Code="10000" Name="HTC Wildfire S-A510E " ProductRange="HTC" ProductSubRange="Wildfire" WebCategory="Mobiles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10001" Name="HTC Wildfire" ProductRange="HTC" ProductSubRange="Wildfire" WebCategory="Mobiles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10002" Name="Samsung Galaxy S3" ProductRange="Samsung" ProductSubRange="Galaxy" WebCategory="Mobiles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10003" Name="Samsung Galaxy S2" ProductRange="Samsung" ProductSubRange="Galaxy" WebCategory="Mobiles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10004" Name="Samsung Galaxy S1" ProductRange="Samsung" ProductSubRange="Galaxy" WebCategory="Mobiles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10005" Name="Samsung Galaxy Tabloid" ProductRange="Samsung" ProductSubRange="Galaxy Tabloids" WebCategory="Gadgets" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10006" Name="Apple Ipad 3" ProductRange="Apple" ProductSubRange="Tabloids" WebCategory="Gadgets" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10007" Name="Apple Iphone 4S" ProductRange="Apple" ProductSubRange="Iphone" WebCategory="Mobiles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10008" Name="Apple Iphone 3G" ProductRange="Apple" ProductSubRange="Iphone" WebCategory="Mobiles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10009" Name="Miscrosoft XBOX 360 Elite" ProductRange="Microsoft" ProductSubRange="XBOX" WebCategory="Consoles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10010" Name="Sony Playstation 4" ProductRange="Sony" ProductSubRange="Playstation" WebCategory="Consoles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10011" Name="Sony PSP Go" ProductRange="Microsoft" ProductSubRange="PSP" WebCategory="Consoles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10012" Name="Sony Erricsson Satio" ProductRange="Sony Ericsson" ProductSubRange="Satio Series" WebCategory="Mobiles" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
<Row Code="10013" Name="TomTom Go Live Gl2" ProductRange="TomTom" ProductSubRange="Go Live" WebCategory="Navigation" WebDescription="Available in black and white.lightweight." Productlength="46mm" ProductWidth="16mm" ProductHeight="21.000" Weight="400gm" Description="Pck: 12 Plt: 1152" /> 
</Rows> 

我想基于WebCategory从我的XML文件ProductRange获得独一无二的。但是下面编写的PHP代码会生成重复/重复的结果。我不知道我在哪里犯错！

PHP代码：

<? 
$xml = simplexml_load_string(file_get_contents('XML/products.xml')); 
$prifix = '/categories/listings/' ; 
$cat=array(); 
foreach ($xml as $row) { 
$attr = $row->attributes(); 
if (!in_array((string)$attr->WebCategory, $cat)){ 
    printf('<li>%s</li>', anchor($prifix . $attr->Code, $attr->ProductRange)); 
    $cat[] = (string)$attr->WebCategory; 
} 
} 
?> 

请注意： 我想基于给定WebCategory例如，我想告诉根据自己Webcategory这样选择SQL查询中的所有ProductRange提取ProductRange：

 "select ProductRange from XML where WebCategory='Mobiles'" 

它可以给我不同的“ProductRange”（不重复的结果）基于这样的XML：

HTC的
三星
iPhone

等等......我尽我所能，但未能产生使用上述编码方法基于独特的“ProductRange”。

请纠正我在哪里我错了，请引导我在哪里我需要做出改变，以获得独特的ProductRange如上所述。

Answer 1

您可以尝试

$list = groupBy($xml, "WebCategory"); 
foreach ($list['Mobiles'] as $product) { 
    printf('<li>%s %s</li>', $product->Code, $product->Name); 
} 

输出

10000 HTC野火S-A510E

10001 HTC野火

10002三星Galaxy S3

10003三星Galaxy S2

10004三星Galaxy S1

10007 Apple Iphone 4S

10008 Apple Iphone 3G

10012索尼Erricsson Satio的

功能用于

function groupBy($xml, $categoryName) { 
    $xml = new \SimpleXMLElement($xml); 
    $category = array(); 
    foreach ($xml as $row) { 
     $attr = $row->attributes(); 

     if (! isset($attr->$categoryName)) { 
      trigger_error("$categoryName does not exist in XML"); 
      break; 
     } 

     $category[(string) $attr->$categoryName][] = $attr; 
    } 
    return $category; 
} 

See live Demo