PHP用一个HTML Break替换双行 [英] PHP replace double-lines with one HTML Break

问题描述

我正在使用< BR> 标签替换我的服务器上的所有\\\
\\\
，以便单个\\\
不会变为< BR> 。

I am trying to replace all \n\n on my server with the <BR> tag so that a single \n does not turn into <BR>.

示例：

Hello,\n\nThis is an\nexample.\n\nThanks!

转到：

Hello,<BR>This is an\nexample,<BR>Thanks!

（注意单个\\\
未被替换）

(notice the single \n was not replaced)

当我在PHP中执行以下操作时，它不会用中断替换两行：

When I do the following in PHP, it does not replace the two lines with a break:

$str = str_replace("\n\n", "<br />", $str);

推荐答案

您的 \\\
实际上是 \r\\\
（这意味着输入来自Windows操作系统），我建议你将换行符归一化到* nix标准首先使用以下正则表达式：

Your \n are actually \r\n (which means the input came from a Windows operating system), I suggest you normalize you newlines to the *nix standard first with the following regular expression:

$str = preg_replace('~\r\n?~', "\n", $str);

然后，您的原始代码段将工作（ demo ）：

Then, your original snippet will work (demo):

$str = str_replace("\n\n", '<br />', $str);

---

您还可以：

---

You could also just do:

$str = str_replace("\r\n\r\n", '<br />', $str);

但是，如果输入来自Linux或旧的Mac OS（仅使用 \r ）。

But that wouldn't work if the input came from Linux or a old Mac OS (which only uses \r).

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