使用php计算无序列表中列表项的总数
[英]count total number of list items in unordered list using php
问题描述
I want to count the total number of items within an ordered list, i though this would be a fairly common question on Google but apparently not. 
我想计算订购清单中的物品总数，尽管这在Google上是一个相当普遍的问题，但显然不是。
I have tried using PHP's count function but im not sure if it works for lists as it appears to be only relevant to PHP arrays. 我试过使用PHP的count函数，但是我不确定它是否适用于列表，因为它似乎仅与PHP数组有关。
echo '<p>' . count($TheList, 1) . '</p>';
The total of the list should appear in a paragraph within a Div lower down my page but it throws an error. 列表的总数应显示在我页面下方的Div内的一个段落中，但会引发错误。
The list looks like this: 该列表如下所示：
echo '<ul id="TheList" >';
echo '<li> peas </li>';
echo '<li> carrots </li>';
echo '<li> onions </li>';
echo '</ul>';
Really all i am trying to do is count how many items are in the unordered list. 我真正想做的就是计算无序列表中有多少项。
5 个解决方案
解决方案1
4 已采纳 2014-01-26 20:51:12
If you're trying to count DOM elements, you should use an HTML parser. 如果要计算DOM元素，则应使用HTML解析器。 Here's an example with DOMDocument 这是DOMDocument的示例
$html = '<ul id="TheList">
<li> peas </li>
<li> carrots </li>
<li> onions </li>
</ul>';
$doc = new DOMDocument();
$doc->loadHTML($html);
print $doc->getElementsByTagName('li')->length;
OUTPUT: 输出：
3
This works even if the list items have attributes (ids, classes, etc...) or strange formats. 即使列表项具有属性（ID，类等）或奇怪的格式，此方法也有效。 Example: 例：
$html = '<ul id="TheList">
<li > peas </li>
<li id="foo"> carrots </li>
<li class="bar"> onions </li>
</ul>';
解决方案2
2 2014-01-26 20:54:50
Did you try using javaScript? 您尝试使用javaScript吗？
var theList = document.getElementById("TheList").getElementsByTagName("li");
var numberOfItems = theList.length;
解决方案3
1 2014-01-26 20:50:01
As others have pointed out, there are more appropriate ways to do this, but in the intrests of learning, here is a way you could use php to count the number of list items in a string of html code... 正如其他人指出的那样，还有其他更合适的方法可以做到这一点，但是在学习的兴趣上，这是一种您可以使用php来计数一串html代码中列表项的数量的方法...
$liststring = "<ul id=\"TheList\" >"
. "<li> peas </li>"
. "<li> carrots </li>"
. "<li> onions </li>"
. "</ul>";
$numitems = substr_count($liststring, "<li>");
echo "<p>$numitems</p>";
echo $liststring;
解决方案4
1 2014-01-26 20:51:35
if you're trying to process html code, you could try to do this: 如果您尝试处理html代码，则可以尝试执行以下操作：
function count_list($list){
$array = explode("</li>",$list);
return count($list)-1;
}
解决方案5
1 2014-01-26 20:53:39
PHP is Server Side while HTML is presentation at Client Side. PHP是服务器端，而HTML是客户端。
If you generate those li elements from a PHP script, than you can just save the count when echoing the results and echo the Count of it everywhere you want. 如果从PHP脚本生成这些li元素，则可以在回显结果时保存Count ，并在需要的任何地方回显Count 。
I'm guessing you're not using some PHP script in order to generate and echo the list, therefore you can use JavaScript to help you solve this case. 我猜您不是在使用某些PHP脚本来生成和回显列表，因此您可以使用JavaScript来解决这种情况。
JavaScript code: JavaScript代码：
<html>
<head>
<title></title>
</head>
<body>
<p id="TheList_Count">0</p>
<ul id="TheList">
<li> peas </li>
<li> carrots </li>
<li> onions </li>
</ul>
<script>
document.getElementById("TheList_Count").innerHTML = document.getElementById("TheList").children.length;
</script>
</body>
</html>
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