如何用< br/>替换换行符或\ r \ n? [英] How can I replace newline or \r\n with <br/>?

问题描述

我试图简单地替换一些新行，并尝试了三种不同的方式，但是我没有任何改变:

I am trying to simply replace some new lines and have tried three different ways, but I don't get any change:

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

这些都应该起作用，但是我仍然可以换行.它们是双倍的:"\ r \ r".那不应该使任何这些失败，对吧?

These should all work, but I still get the newlines. They are double: "\r\r". That shouldn't make any of these fail, right?

推荐答案

已经有 nl2br() 在新行字符之前插入 <br>标签的功能:

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

示例(键盘):

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

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

但是，如果仍然无法正常工作，请确保将文本$desciption用双引号引起来.

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

那是因为与双引号字符串相比，单引号不会扩展"诸如\n的转义序列.引用PHP文档:

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

注意:与双引号和Heredoc语法不同，特殊字符的变量和转义序列在单引号引起来的字符串中不会扩展.

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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