Question

下面的XMLReader / Xpath代码可以正常工作而没有if语句（在第二个while循环中）。当放入if语句时，页面甚至不会加载。关于if语句有什么问题的任何建议？谢谢！

$reader = new XMLReader;
$reader->open('products.xml');
$dom = new DOMDocument;
$xpath = new DOMXpath($dom);

while ($reader->read() && $reader->name !== 'product') {
continue;
}

while ($reader->name === 'product') {
$node = $dom->importNode($reader->expand(), TRUE);

if ($xpath->evaluate('number(price)', $node) < 500) {

$category = $xpath->evaluate('string(@category)', $node);
$name = $xpath->evaluate('string(name)', $node);
$price = $xpath->evaluate('number(price)', $node);

echo "Category: " . $category . ". ";
echo "Name: " . $name . ". ";
echo "Price: " . $price . ". ";
echo "<br>";

$reader->next('product');
}}

以下是XML文件的位代码，名为products.xml：

<products>

<product category="Desktop">
<name> Desktop 1 (d)</name>
<price>499.99</price>
</product>

<product category="Tablet">
<name>Tablet 1 (t)</name>
<price>1099.99</price>
</product>

</products>

Answer 1

$ reader-＆gt; next（'product'）的位置;是错的。它应该是第一个支撑。

即

$reader->next('product');
}}

到

}
$reader->next('product');
}

PHP - 带有if语句的XMLReader问题

1 个答案: