stackoom
  简体   繁体   中英

PHP check if element exists in XML

 原文  2016-05-11 11:24:09  2   1    php/ mysql/ xml/ csv

Question

I try to read a XML file, show the data in a table and write the needed data into a MySQL Database so that i can later extract the data as CSV.

In the XML are a set of data that all have the same name.

Each product has a different amount of < props> (max 20) and I want to check if a element < props> exit or not. Right now I get all 'data' from props.

it's difficult for me to explain so i will show the nested elements with the specific data. EDIT: Now the complete Data of a Product. 

        <?xml version="1.0" encoding="UTF-8"?>
            <products>
              <product>
                <id>1</id>
                <artnr>3009000555</artnr>
                <title>product</title>
                <description>Some long text</description>
                <brand>
                  <id>458</id>
                  <title>Brand</title>
                </brand>
                <date>11-05-2015</date>
                <modifydate>07-05-2016</modifydate>
                <variants>
                  <variant>
                    <id>35021</id>
                    <type></type>
                    <subartnr>3009000555</subartnr>
                    <ean>85252000555</ean>
                    <stock>Y</stock>
                  </variant>
                </variants>
                <price>
                  <currency>EUR</currency>
                  <b2b>9.39</b2b>
                  <b2c>16.95</b2c>
                  <vatnl>21</vatnl>
                  <vatde>19</vatde>
                  <discount>N</discount>
                </price>
                <categories>
                  <category>
                    <cat>
                      <id>1</id>
                      <title>Maincat</title>
                    </cat>
                    <cat>
                      <id>182</id>
                      <title>Subcat</title>
                    </cat>
                  </category>
                </categories>
                <measures>
                  <length>4.00</length>
                  <weight>243</weight>
                  <packing>10x9x10</packing>
                </measures>
                <properties>
                  <prop>
                    <propid>25</propid>
                    <property>Farbe</property>
                    <valueid>208</valueid>
                    <value>Weiß</value>
                  </prop>
                  <prop>
                    <propid>41</propid>
                    <property>Geeignet für</property>
                    <valueid>229</valueid>
                    <value>Unisex</value>
                  </prop>
                  <prop>
                    <propid>43</propid>
                    <property>Verpackung</property>
                    <valueid>236</valueid>
                    <value>Einzelhandelverpackung (Karton)</value>
                  </prop>
                  <prop>
                    <propid>54</propid>
                    <property>Gesamturteil</property>
                    <valueid>289</valueid>
                    <value>5</value>
                  </prop>
                  <prop>
                    <propid>70</propid>
                    <property>Garantie</property>
                    <valueid>326</valueid>
                    <value>Ja</value>
                  </prop>
                  <prop>
                    <propid>71</propid>
                    <property>Art der Garantie</property>
                    <valueid>328</valueid>
                    <value>Good Warranty Service</value>
                  </prop>
                </properties>
                <material>
                  <id>101</id>
                  <title>Keramik</title>
                </material>
                <popularity>3</popularity>
                <pics>
                  <pic>3009000022.jpg</pic>
                  <pic>3009000022_2.jpg</pic>
                </pics>
              </product>
              <product>

Here is what i have right now but as i said before, i get also non existing props as empty data. eg ::7, Edit. Now my whole code. This product has only 7 < props> other have 9 oder 15 or what ever. So i need only shown existing props. but yet i get all from prop[0] to prop[19] even if they not exist. 

        <html>
      <table id="mytable">
        <thead>
          <tr>        
            <th>Artnr</th>
            <th>Name</th>
            <th>Beschreibung</th>
            <th>Hersteller</th>
            <th>EAN</th>
            <th>Vorrat</th>
            <th>Preis EK</th>
            <th>Preis VK</th>
            <th>Sonderangebot</th>   
            <th>Kategorie</th>
            <th>Eigenschaften</th>
            <th>Bild URL</th>       
          </tr>
        </thead>
        <tbody>

     <?php

      $url = ('http://somdom.com/test1.xml');
      $xml = simplexml_load_file( urlencode($url), null, true);
      $kommaleerz = ', ';
      $doppelpunkt = ':';
      $bildaddy = 'http://somedom.com/img/product_pic/500/';


       foreach ( $xml->product as $prods ) :?>
          <tr>        
            <td><?php echo $prods->artnr; ?></td>
            <td><?php echo $prods->title; ?></td>
            <td><?php echo $prods->description; ?></td>
            <td><?php echo $prods->brand->title; ?></td>
            <td><?php echo $prods->variants->variant->ean; ?></td>
            <td><?php echo $prods->variants->variant->stock; ?></td>
            <td><?php echo $prods->price->b2b; ?></td>
            <td><?php echo $prods->price->b2c; ?></td>
            <td><?php echo $prods->price->discount; ?></td>
            <td><?php echo $prods->categories->category->cat[1]->title; ?></td>       
            <td><?php if (isset($prods->properties->prop)) {echo $prods->properties->prop[0]->property . $doppelpunkt . $prods->properties->prop[0]->value .$doppelpunkt .'1' .$kommaleerz 
                          .$prods->properties->prop[1]->property . $doppelpunkt . $prods->properties->prop[1]->value .$doppelpunkt .'2' .$kommaleerz
                          .$prods->properties->prop[2]->property . $doppelpunkt . $prods->properties->prop[2]->value .$doppelpunkt .'3' .$kommaleerz
                          .$prods->properties->prop[3]->property . $doppelpunkt . $prods->properties->prop[3]->value .$doppelpunkt .'4' .$kommaleerz        
                          .$prods->properties->prop[4]->property . $doppelpunkt . $prods->properties->prop[4]->value .$doppelpunkt .'5' .$kommaleerz        
                          .$prods->properties->prop[5]->property . $doppelpunkt . $prods->properties->prop[5]->value .$doppelpunkt .'6' .$kommaleerz         
                          .$prods->properties->prop[6]->property . $doppelpunkt . $prods->properties->prop[6]->value .$doppelpunkt .'7' .$kommaleerz
                          .$prods->properties->prop[7]->property . $doppelpunkt . $prods->properties->prop[7]->value .$doppelpunkt .'8' .$kommaleerz
                          .$prods->properties->prop[8]->property . $doppelpunkt . $prods->properties->prop[8]->value .$doppelpunkt .'9' .$kommaleerz
                          .$prods->properties->prop[9]->property . $doppelpunkt . $prods->properties->prop[9]->value .$doppelpunkt .'10' .$kommaleerz        
                          .$prods->properties->prop[10]->property . $doppelpunkt . $prods->properties->prop[10]->value .$doppelpunkt .'11' .$kommaleerz        
                          .$prods->properties->prop[11]->property . $doppelpunkt . $prods->properties->prop[11]->value .$doppelpunkt .'12' .$kommaleerz         
                          .$prods->properties->prop[12]->property . $doppelpunkt . $prods->properties->prop[12]->value .$doppelpunkt .'13' .$kommaleerz                
                          .$prods->properties->prop[13]->property . $doppelpunkt . $prods->properties->prop[13]->value .$doppelpunkt .'14' .$kommaleerz
                          .$prods->properties->prop[14]->property . $doppelpunkt . $prods->properties->prop[14]->value .$doppelpunkt .'15' .$kommaleerz        
                          .$prods->properties->prop[15]->property . $doppelpunkt . $prods->properties->prop[15]->value .$doppelpunkt .'16' .$kommaleerz        
                          .$prods->properties->prop[16]->property . $doppelpunkt . $prods->properties->prop[16]->value .$doppelpunkt .'17' .$kommaleerz         
                          .$prods->properties->prop[17]->property . $doppelpunkt . $prods->properties->prop[17]->value .$doppelpunkt .'18' .$kommaleerz 
                          .$prods->properties->prop[18]->property . $doppelpunkt . $prods->properties->prop[18]->value .$doppelpunkt .'19' .$kommaleerz         
                          .$prods->properties->prop[19]->property . $doppelpunkt . $prods->properties->prop[19]->value .$doppelpunkt .'20' .$kommaleerz
                          .'Material' . $doppelpunkt . $prods->material->title .$doppelpunkt .'21' ;} ?> </td>                
            <td><?php echo $bildaddy . $prods->pics->pic[0] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[1] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[2] . $kommaleerz                
                                   .$bildaddy . $prods->pics->pic[3] . $kommaleerz 
                                   .$bildaddy . $prods->pics->pic[4] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[5] . $kommaleerz                
                                   .$bildaddy . $prods->pics->pic[6] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[7] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[8] . $kommaleerz                
                                   .$bildaddy . $prods->pics->pic[9] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[10] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[11] . $kommaleerz                
                                   .$bildaddy . $prods->pics->pic[12] . $kommaleerz 
                                   .$bildaddy . $prods->pics->pic[13] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[14] . $kommaleerz                
                                   .$bildaddy . $prods->pics->pic[15] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[16] . $kommaleerz
                                   .$bildaddy . $prods->pics->pic[17] . $kommaleerz                
                                   .$bildaddy . $prods->pics->pic[18] . $kommaleerz               

                    ; ?></td>          
          </tr>
      <?php endforeach; ?>

       </tbody>
      </table>
    </body>
    </html>

1 answers

solution1
 2 ACCPTED  2016-05-11 11:49:25

SimpleXML implements different interfaces for the properties. If you use it like a string it will return the content of the first matching element. If you use it like a list, you can iterate all matching elements. 

$products = new SimpleXmlElement($xml);

foreach ($products->product as $product) {
  foreach ($product->properties->prop as $property) {
    var_dump((string)$property->property);
  }
}

Output: 

string(5) "Farbe"
string(13) "Geeignet für"
string(10) "Verpackung"
string(12) "Gesamturteil"
string(8) "Garantie"
string(16) "Art der Garantie"

I would suggest defining an array of default values for each propid that you like to read. The propid should be more stable then the title and is not language specific. In the inner loop you validate that the id of the current exists in that array and assign the value or valueid . 

foreach ($products->product as $product) {
  // default values for each product property by `prodid`
  $row = [
    '25' => '',
    '41' => ''
  ];
  foreach ($product->properties->prop as $property) {
    $id = (string)$property->propid;
    if (array_key_exists($id, $row)) {
      $row[$id] = (string)$property->value;
    }
  }
  var_dump($row);
}

Output: 

array(2) {
  [25]=>
  string(5) "Weiß"
  [41]=>
  string(6) "Unisex"
}

This way the result will always have the same count and order of elements.

Fetching specific elements if they exists

To fetch a specific property use Xpath. For example to fetch the property with the propid 25: 

foreach ($products->product as $product) {
  $colors = $product->xpath('properties/prop[propid = 25]');
  if (count($colors) > 0) {
    var_dump((string)$colors[0]->property);
  }
}

SimpleXmlElement::xpath() will always return an array of SimpleXmlElement objects. Validate the element count to check if the Xpath expression found a node.

DOM even allows you to fetch the scalar values directly. It will return a empty value if no node matches. The result of DOMXpath::evaluate() depends on the expression. Location paths return a DOMNodeList that is traversable with foreach . A expression that results in a scalar will return the scalar value. 

$document = new DOMDocument();
$document->loadXml($xml);
$xpath = new DOMXpath($document);

foreach ($xpath->evaluate('/products/product') as $product) {
  $hasColor = $xpath->evaluate('count(properties/prop[propid = 25]) > 0', $product);
  if ($hasColor) {
     var_dump('Color:', $xpath->evaluate('string(properties/prop[propid = 25]/valueid)', $product));
  }
}

Output: 

string(6) "Color:"
string(3) "208"

暂无
暂无

The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.

Related Question Check XML if element exists Check if XML Chain Exists in PHP Check if element exists in PHP array PHP - Check if element exists in this Array PHP: Check if XML node exists with attribute How to check if TAG exists inside XML with PHP? Find if an element exists in XML using PHP DOM How to check if a certain element exists using php How to check if namespace element exists in PHP Check element exists using PHP Selenium 2 Webdriver?
Related Tags
 
粤ICP备18138465号  © 2020-2024 STACKOOM.COM