用 PHP 中的换行符替换文字字符串 \r\n 的问题 [英] Problem Replacing Literal String \r\n With Line Break in PHP

问题描述

我有一个文本文件，其中包含文字字符串 \r\n.我想用实际的换行符 (\n) 替换它.

I have a text file that has the literal string \r\n in it. I want to replace this with an actual line break (\n).

我知道正则表达式 /\\r\\n/ 应该匹配它(我已经在 Reggy)，但我无法在 PHP 中使用它.

I know that the regex /\\r\\n/ should match it (I have tested it in Reggy), but I cannot get it to work in PHP.

我尝试了以下变体:

preg_replace("/\\\\r\\\\n/", "\n", $line);

preg_replace("/\\\\[r]\\\\[n]/", "\n", $line);

preg_replace("/[\\\\][r][\\\\][n]/", "\n", $line);

preg_replace("/[\\\\]r[\\\\]n/", "\n", $line);

如果我只是尝试替换反斜杠，它可以正常工作.一旦我添加了 r，它就找不到匹配项.

If I just try to replace the backslash, it works properly. As soon as I add an r, it finds no matches.

我正在阅读的文件被编码为 UTF-16.

The file I am reading is encoded as UTF-16.

我也已经尝试过使用 str_replace().

I have also already tried using str_replace().

我现在认为这里的问题是文件的字符编码.我尝试了以下方法，它确实有效:

I now believe that the problem here is the character encoding of the file. I tried the following, and it did work:

$testString = "\\r\\n";
echo preg_replace("/\\\\r\\\\n/", "\n", $testString);

但它不适用于我从文件中读取的行.

but it does not work on lines I am reading in from my file.

推荐答案

UTF-16 是问题所在.如果您只是使用原始字节，则可以使用完整序列进行替换:

UTF-16 is the problem. If you're just working with raw the bytes, then you can use the full sequences for replacing:

$out = str_replace("\x00\x5c\x00\x72\x00\x5c\x00\x6e", "\x00\x0a", $in);

这假定大端 UTF-16，否则将零字节交换到非零之后:

This assumes big-endian UTF-16, else swap the zero bytes to come after the non zeros:

$out = str_replace("\x5c\x00\x72\x00\x5c\x00\x6e\x00", "\x0a\x00", $in);

如果这不起作用，请发布您输入文件的字节转储，以便我们查看它实际包含的内容.

If that doesn't work, please post a byte-dump of your input file so we can see what it actually contains.

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