如何计算标签内儿童的出现次数？

我是新的PHP。作为一名实习生，我必须使用XML文件中的数据在MySQL中填充数据库。问题是这些XML文件并不总是具有相同的格式。所以，我在php5中编写了一个代码，我想知道如何计算特定小孩在标签中出现的次数。在我的XML文件中，我想要统计节点“ing-div”中出现子节点“ing”的次数。一些XML文件可以有一个，两个或多个“ing-div”节点。任何帮助？如何计算标签内儿童的出现次数？

这里是XML文件

<?xml version="1.0" encoding="UTF-8" ?> 
- <recipeml version="0.5"> 
- <recipe> 
- <head> 
    <title>100 Whole Wheat Bread for Bread Machine</title> 
- <categories> 
    <cat>Breadmaker</cat> 
    <cat>Breads</cat> 
    </categories> 
    <yield>8</yield> 
    </head> 
- <ingredients> 
- <ing-div> 
    <title>REGULAR LOAF</title> 
- <ing> 
- <amt> 
    <qty>1</qty> 
    <unit>cup</unit> 
    </amt> 
    <item>Water</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>2 1/2</qty> 
    <unit>cups</unit> 
    </amt> 
    <item>Wheat bread flour</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1 1/4</qty> 
    <unit>tablespoons</unit> 
    </amt> 
    <item>Dry milk</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1</qty> 
    <unit>teaspoon</unit> 
    </amt> 
    <item>Salt</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1 1/2</qty> 
    <unit>tablespoons</unit> 
    </amt> 
    <item>Butter</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1 1/4</qty> 
    <unit>tablespoons</unit> 
    </amt> 
    <item>Honey</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1</qty> 
    <unit>tablespoon</unit> 
    </amt> 
    <item>Gluten</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>2</qty> 
    <unit>teaspoons</unit> 
    </amt> 
    <item>Molasses</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1 1/2</qty> 
    <unit>teaspoons</unit> 
    </amt> 
    <item>Fast-Rise yeast *** OR ***</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>2</qty> 
    <unit>teaspoons</unit> 
    </amt> 
    <item>Active-Dry yeast</item> 
    </ing> 
    </ing-div> 
- <ing-div> 
    <title>LARGE LOAF</title> 
- <ing> 
- <amt> 
    <qty>1 1/2</qty> 
    <unit>cups</unit> 
    </amt> 
    <item>+ 2 tb Water</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>3 3/4</qty> 
    <unit>cups</unit> 
    </amt> 
    <item>Wheat bread flour</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>2</qty> 
    <unit>tablespoons</unit> 
    </amt> 
    <item>Dry milk</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1 1/2</qty> 
    <unit>teaspoons</unit> 
    </amt> 
    <item>Salt</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>2</qty> 
    <unit>tablespoons</unit> 
    </amt> 
    <item>Butter</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>2</qty> 
    <unit>tablespoons</unit> 
    </amt> 
    <item>Honey</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1 1/2</qty> 
    <unit>tablespoons</unit> 
    </amt> 
    <item>Gluten</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>1</qty> 
    <unit>tablespoon</unit> 
    </amt> 
    <item>Molasses</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>2 1/8</qty> 
    <unit>teaspoons</unit> 
    </amt> 
    <item>Fast-Rise yeast *** OR ***</item> 
    </ing> 
- <ing> 
- <amt> 
    <qty>3</qty> 
    <unit>teaspoons</unit> 
    </amt> 
    <item>Active-Dry yeast</item> 
    </ing> 
    </ing-div> 
    </ingredients> 
- <directions> 
    <step>The trick to making 100% whole wheat bread in your machine is an extra knead, which gives the yeast and gluten a second chance to create a lighter loaf. When your first knead cycle is completed, simply reset the machine and start again. Some manufacturers produce home bakeries with a whole wheat cycle; if your machine doesn't have one, this start- again method works as an easy alternative. SUCCESS HINTS: The gluten gives the whole wheat flour the structure necessary for a good loaf. If your market doesn't stock wheat gluten, try your local health food store. Remember the extra knead. It's especially important in 100% whole wheat bread. Because of the extra knead, us this recipe only on the regular bake cycle. CALORIES: 125 PROTEIN: 14% CHOLESTEROL: 3.98mg CARBOHYDRATES: 73% SODIUM: 218mg FAT: 13% Posted to Bakery-Shoppe Digest V1 #410 by [email protected] (Serge Cyr) on Nov 23, 1997</step> 
    </directions> 
    </recipe> 
    </recipeml>

而这正是我试图“荷兰国际集团-DIV”

$xml = simplexml_load_file($file); 
$ing_elem = new SimpleXMLElement($xml); 
printf("%d ing.\n", $ing_elem->{'ing-div'}->count());

内计数“ing”的的出现次数的数量的部分代码但它根本不起作用。我有错误消息：用C未捕获的异常“异常”与消息“字符串不能被解析为XML”：：

致命错误\瓦帕\ WWW \ PHP \文件夹XML \ New_Load_All_Files_1.php上线115

anny建议？

非常感谢你的时间和你的帮助。

T3000

来源

2011-06-16 T3000

您确定您正在加载xml吗？您收到的错误意味着简单的XML无法读取/解析xml文件。正如它写的那样，它期望'$ file'成为xml文件的有效文件路径。你确定它是正确的吗？如果是这样，你确定xml是有效的吗？ – bejonbee 2011-06-16 21:34:43

$xml = new DOMDocument(); 
$xml->load(path/to/file); 
$xpath = new DOMXPath($xml); 
$ingdiv = $xpath->query("/recipeml/recipe/ingredients/ing-div"); 
$length = $ingdiv->length; 
// iterate over all <ing-div> from last to first 
while($length--) 
{ 
    // number of <ing> in the specific <ing-div> 
    print $xpath->query("ing", $ingdiv->item($length))->length; 
}

编辑：

你不应该复制粘贴&从浏览器格式化输出。

<?xml version="1.0" encoding="UTF-8" ?> 
- <recipeml/>

这是格式错误的XML。 XML不能在根节点之外具有文本。

来源

2011-06-16 21:38:48 Saxoier

我不认为你需要下面一行：

$ing_elem = new SimpleXMLElement($xml);

，因为使用的是使用simplexml_load_file（$文件）创建一个SimpleXMLElement对象

所以你的SimpleXML对象只能用这个来创建行：

$ing_elem = simplexml_load_file($file);

您可以使用下面的代码片段，以获取有关错误的信息，这可能会发生：

libxml_use_internal_errors(true); 
$ing_elem = simplexml_load_file($file); 
if (!$ing_elem) { 
    echo "Failed loading XML\n"; 
    foreach(libxml_get_errors() as $error) { 
     echo "\t", $error->message; 
    } 
}

来源

2011-06-16 21:40:59 Andreas

但是如果idelete行$ ing_elem = new SimpleXMLElement（$ xml）;我会遇到以下问题，因为我的变量$ ing_elem将不再被定义。 – T3000 2011-06-16 21:45:38

如何计算标签内儿童的出现次数？

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