PHP Foreach循环和DOMNodeList [英] PHP Foreach Loop and DOMNodeList

问题描述

我试图确定一个用DOMNodeList集合播种的foreach循环的结束。目前，我正在使用一个for循环，希望避免在那里有一个魔术号码。我知道只有8列，但我希望代码我通用的其他应用程序。

是否有可能将其转换为一个Foreach循环？我已经尝试了end（）和next（）函数，但是它们没有返回任何数据，我怀疑它们只能在数组上而不是这个DOMNodeList集合中。

该代码正在建立一个CSV文件，没有结尾的'，'

当前输出是：
$ b

值1 值2值3值4值5值6值7值8

< >以下是一个代码示例：

  $ cols = $ row-> getElementsByTagName（td）; 
 $ printData = true; 
 
 //丢掉标题行
 if（$ isFirst&& $ printData）{
 $ isFirst = false; 
继续; 
 
 
（$ i = 0; $ i <= 8; $ i ++）{
 $ output = iconv（UTF-8，ASCII // IGNORE，$ cols-> item（$ i） - > nodeValue）; 
 $ output2 = trim（$ output）; 
 if（$ i == 8）{
 //最后一列
 echo\。$ output2。\。 \\\
; 
} else {
 echo\。$ output2。\。 ; 
 
 
 
 $ div $解析方案

可以使用：



  $ cols->长度
  

检索DOMNodeList中的项目数量。



请参阅 http://php.net/manual/en/class.domnodelist.php

编辑：
如果你改变了你的代码，你不必担心后面的逗号或长度：

  $ output = array（）; 
 foreach（$ cols as $ item）{
 $ output = iconv（UTF-8，ASCII // IGNORE，$ item-> nodeValue）; 
 $ output2 = trim（$ output）; 
 
 $ output [] =''。$ output2。''; 
} 
 $ outputstring = implode（'，'，$ output）; 
  

I am trying to determine the end of a foreach loop that is seeded with a collection of DOMNodeList. Currently, I am using a for loop would like to avoid having a 'magic' number there. I do know there are only going to be 8 columns, but I would like the code me generic for other applications.

Is it possible to convert this to a Foreach loop? I have tried the end() and next() functions, but they are not returning any data and I suspect that they only work on arrays and not this DOMNodeList collection.

The code is building a CSV file without the trailing ','

Current output is:

"Value 1","Value 2","Value 3","Value 4","Value 5","Value 6","Value 7","Value 8"

Here is an example of code:

$cols = $row->getElementsByTagName("td");
$printData = true;

// Throw away the header row
if ($isFirst && $printData) {
   $isFirst = false;
   continue;
}

for ($i = 0; $i <= 8; $i++) {
   $output = iconv("UTF-8", "ASCII//IGNORE", $cols->item($i)->nodeValue);
   $output2 = trim($output);
   if ($i == 8) {
      // Last Column
      echo "\"" . $output2 . "\"" . "\n";
   } else {
      echo "\"" . $output2 . "\"" . ",";
   }
}

解决方案

You can use:

$cols->length

To retrieve the number of items in a DOMNodeList.

See http://php.net/manual/en/class.domnodelist.php

Edit: If you change you're code to this, you don't have to worry about the trailing comma, or the length:

$output = array();
foreach ($cols as $item) {
   $output = iconv("UTF-8", "ASCII//IGNORE", $item->nodeValue);
   $output2 = trim($output);

   $output[] = '"' . $output2 . '"';
}
$outputstring = implode(',', $output);

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