获取博客文章第一段中的字符串

发布于 2024-11-16 20:35:33 字数 269 浏览 0 评论 0原文

想象一下我的字符串是

$str = "<p>paragraph 1</p><p>paragraph 2</p><p>paragraph 3</p>";

，我想得到......

$firstParagraph = "paragraph 1"

最好的方法是什么？

是否可以轻松地将每个段落拆分为一个数组？

原文

Imagine my string is

$str = "<p>paragraph 1</p><p>paragraph 2</p><p>paragraph 3</p>";

and I want to get...

$firstParagraph = "paragraph 1"

What would be the best way of doing that?

Is it possible to split each paragraph into an array easily?

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魔法唧唧 2024-11-23 20:35:33

$dom = new DOMDocument();
$dom->loadHTML($str);

$xp = new DOMXPath($dom);

$res = $xp->query('//p');

$firstParagraph = $res[0]->nodeValue;

$dom = new DOMDocument();
$dom->loadHTML($str);

$xp = new DOMXPath($dom);

$res = $xp->query('//p');

$firstParagraph = $res[0]->nodeValue;

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相权↑美人 2024-11-23 20:35:33

我正在快速输入此内容，但不会：

$str = "<p>paragraph 1</p><p>paragraph 2</p><p>paragraph 3</p>";
preg_match('/<p>(.*?)<\/p>/i', $str, $paragraphs);
echo $paragraphs[0]; // Paragraph 1

比其他解决方案更有效地工作吗？

I'm typing this up quickly, but wouldn't:

$str = "<p>paragraph 1</p><p>paragraph 2</p><p>paragraph 3</p>";
preg_match('/<p>(.*?)<\/p>/i', $str, $paragraphs);
echo $paragraphs[0]; // Paragraph 1

work more efficiently than these other solutions?

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友欢 2024-11-23 20:35:33

你问的是两件事。但是，

$array = preg_split('#</p><p>|<p>|</p>#i', $string, -1, PREG_SPLIT_NO_EMPTY)

您可以将段落拆分为一个数组，$string 是带有段落的字符串。

要仅获取第一段，请使用：

preg_match('#^<p>(.*?)</p>#i', $string, $matches)

$matches 将包含您想要的内容。与之前的正则表达式相比，这甚至具有更高的内存效率和更快的速度。如果我见过的话，我不应该提及使用面向对象的 xml 解析器的解决方案完全是大材小用。

You are asking two things. But with

$array = preg_split('#</p><p>|<p>|</p>#i', $string, -1, PREG_SPLIT_NO_EMPTY)

you can split the paragraphs into an array, $string being your string with the paragraphs.

To get the first paragraph only, use:

preg_match('#^<p>(.*?)</p>#i', $string, $matches)

$matches will contain what you want. And this is even more memory efficient and quicker than the previous regex. I shouldn't have to mention that solutions with object oriented xml parsers are total overkills if I've ever seen one.

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