如何用 < br/> 替换换行符或 r n？

我试图简单地更换一些新的台词，并尝试了三种不同的方法，但我没有得到任何改变:

$description = preg_replace('/\r?\n|\r/', '<br/>', $description);
$description = str_replace(array("\r\n", "\r", "\n"), "<br/>", $description);
$description = nl2br($description);

这些应该都能用，但我还是能看到新台词。它们是“ r”的两倍。这样应该不会出问题吧？

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最佳答案

There is already the nl2br() function that inserts <br> tags before new line characters:

Example (codepad):

<?php
// Won't work
$desc = 'Line one\nline two';
// Should work
$desc2 = "Line one\nline two";


echo nl2br($desc);
echo '<br/>';
echo nl2br($desc2);
?>

But if it is still not working make sure the text $desciption is double-quoted.

That's because single quotes do not 'expand' escape sequences such as \n comparing to double quoted strings. Quote from PHP documentation:

Note: Unlike the double-quoted and heredoc syntaxes, variables and escape sequences for special characters will not be expanded when they occur in single quoted strings.

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If you are using nl2br, all occurrences of \n and \r will be replaced by <br>. But if (I don’t know how it is) you still get new lines you can use

str_replace("\r","",$description);
str_replace("\n","",$description);

to replace unnecessary new lines by an empty string.

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nl2br() as you have it should work fine:

$description = nl2br($description);

It's more likely that the unclosed ' on the first line of your example code is causing your issue. Remove the ' after $description...

...$description');
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Try using this:

$description = preg_replace("/\r\n|\r|\n/", '<br/>', $description);
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You may have real characters "\" in the string (the single quote strings, as said @Robik).

If you are quite sure the '\r' or '\n' strings should be replaced as well, I'm not talking of special characters here but a sequence of two chars '\' and 'r', then escape the '\' in the replace string and it will work:

str_replace(array("\r\n","\r","\n","\\r","\\n","\\r\\n"),"<br/>",$description);
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This will work for sure:

str_replace("\\r", "<br />", $description);
str_replace("\\n", "<br />", $description);
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nl2br() worked for me, but I needed to wrap the variable with double quotes:

This works:

$description = nl2br("$description");

This doesn't work:

$description = nl2br($description);
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Try this:

echo str_replace(array('\r\n', '\n\r', '\n', '\r'), '<br>', $description);
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I think str_replace(array("\\r\\n", "\\r", "\\n"), " ", $string); will work.

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$description = nl2br(stripcslashes($description));

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