如何使用PHP计算HTML代码的行数? [英] How can I count the amount of lines of an HTML code with PHP?

问题描述

我有一个由WYSIWYG编辑器(WordPress)生成的HTML.
我想通过最多显示三行文本(HTML格式)来显示此HTML的预览.

I have some HTML generated by a WYSIWYG-editor (WordPress).
I'd like to show a preview of this HTML, by only showing up to 3 lines of text (in HTML format).

示例HTML:(始终以新行格式)

<p>Hello, this is some generated HTML.</p>
<ol>
    <li>Some list item<li>
    <li>Some list item</li>
    <li>Some list item</li>
</ol>

我想在这种格式的HTML中最多预览4行文本.

I'd like to preview a maximum of 4 lines of text in this formated HTML.

要显示的预览示例:(数字代表行号，而不是实际输出).

Example preview to display: (numbers represent line numbers, not actual output).

1. 您好，这是一些生成的HTML.
3. 某些列表项
4. 某些列表项

使用Regex可以做到这一点，还是我可以使用其他方法?
我质疑并回答

Would this be possible with Regex, or is there any other method that I could use?
I know this would be possible with JavaScript in a 'hacky' way, as questioned and answered on this post.
But I'd like to do this purely on the server-side (with PHP), possibly with SimpleXML?

推荐答案

使用XPath非常简单:

It's really easy with XPath:

$string = '<p>Hello, this is some generated HTML.</p>
    <ol>
        <li>Some list item</li>
        <li>Some list item</li>
        <li>Some list item</li>
    </ol>';

// Convert to SimpleXML object
// A root element is required so we can just blindly add this
// or else SimpleXMLElement will complain
$xml = new SimpleXMLElement('<root>'.$string.'</root>');

// Get all the text() nodes
// I believe there is a way to select non-empty nodes here but we'll leave that logic for PHP
$result = $xml->xpath('//text()');

// Loop the nodes and display 4 non-empty text nodes
$i = 0;
foreach( $result as $key => $node )
{
    if(trim($node) !== '')
    {
        echo ++$i.'. '.htmlentities(trim($node)).'<br />'.PHP_EOL;
        if($i === 4)
        {
            break;
        }
    }
}

输出:

1. Hello, this is some generated HTML.<br />
2. Some list item<br />
3. Some list item<br />
4. Some list item<br />

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