如何给php-xml总计数id

Question

我有xml的问题，我正在使用PHP。对我来说需要总id。使用此代码获取所有产品的总ID。

$xmlArray = array();
foreach($xml->Product as $product) { $xmlArray[] = array("productID" => (string)$product->Book); }
$total = count($xmlArray);

但对我来说只需要php book total id，我的php书籍总代码为

$xmlArray2 = array();
foreach($xml->Product as $product2) { $xmlArray2[] = array("PHP" => (string)$product->Book); }
$total = count($xmlArray2);

但是给所有产品总ID。所有代码：

$inPage = 10;
$currentRecord = 10;

$xml = new SimpleXMLElement('http://examplesite.com/xmlinfo.xml', 0, true);

$xmlArray = array();

foreach($xml->Product as $product) { $xmlArray[] = array("prouctID" => (string) $product->Book); }

$total = count($xmlArray);

$toplamPage = ceil($total / $inPage);

foreach($xml->Product as $value) {

        if($value->Book == "PHP") {
            $currentRecord += 1;
            if($currentRecord > ($page * $inPage) && $currentRecord < ($page * $inPage + $inPage)) {
                echo '<div class="BrandTab">';
                echo '<a href="product.php?productID=' . $value->UrunID . '"><img src="' . $value->ImageName . '" style="width:130px;height:200px;/></a>';
                echo '<article>';
                echo '<div class="ok"></div>';
                echo '<p>' . $value->ProductName . '</p>';
                echo '</article>';
                echo '</div>';
            }
        }
    }

Answer 1

使用DOM和XPath，您可以使用DOMXpath :: evaluate（）直接获取值。您也可以获取已过滤的产品列表。与使用API​​函数相比，您可以避免很多循环和条件。

$xml = <<<'XML'
<Products>
  <Product>
    <Book>PHP</Book>
  <Product>
  </Product>
    <Book>JavaScript</Book>
  </Product>
</Products> 
XML;

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

var_dump($xpath->evaluate('count(//Product[normalize-space(Book) = "PHP"])'));

var_dump($xpath->evaluate('//Product[normalize-space(Book) = "PHP"]')->length);

输出

float(1)
int(1)

Xpath表达式

• 获取所有Product元素...
  //Product

• ... Book元素等于PHP ...
  //Product[Book = 'PHP']

• ...规范化空格后...
  //Product[normalize-space(Book) = 'PHP']

• ...并将节点计数作为数字返回：
  count(//Product[normalize-space(Book) = 'PHP'])

Answer 2

试试这个：

$xmlArray2 = array();
foreach($xml->Product as $product2) {
    if( (string)$product->Book == 'PHP' ) {
        $xmlArray2[] = array("PHP" => (string)$product->Book);
    }
}
$total = count($xmlArray2);