XML复杂解析[重复]

Question

可能重复：
distinct in Xpath?

我正在尝试使用 PHP 从我的 XML 文件中提取数据。我想从我的 XML 文件中基于WebCategory 获得唯一的ProductRange。但是下面编写的 PHP 代码会产生重​​复/重复的结果。我不知道我在哪里犯错！这是代码：

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>

我想从我的 XML 文件中获得基于 WebCategory 的唯一 ProductRange。但是下面编写的 PHP 代码会产生重​​复/重复的结果。我不知道我在哪里犯错了！

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： 我想根据给定的WebCategory 提取ProductRange，例如我想根据他们的Webcategory 显示所有ProductRange，就像这样选择SQL 查询：

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

它可以给我基于 XML 的不同的“ProductRange”（非重复结果），如下所示：

宏达电
三星
苹果手机

等等...我尽了最大努力，但未能使用上述编码方法生成唯一的“ProductRange”。

请纠正我的错误，并请指导我在哪里需要进行更改以获得独特的ProductRange，如上所述。

Answer 1

你可以试试

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

输出

10000 HTC Wildfire S-A510E

10001 HTC 野火

10002 三星 Galaxy S3

10003 三星 Galaxy S2

10004 三星 Galaxy S1

10007苹果iphone 4S

10008苹果iphone 3G

10012 索尼爱立信 Satio

使用的功能

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