如何替换\r&amp; \\\<br/>与&lt; br /&gt ;? [英] How to replace \r &amp; \n with &lt;br/&gt;?

问题描述

试图简单地替换一些新的行。尝试了3种不同的方法，我没有任何改变：

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

这些应该都可以工作，但我仍然会换行。他们是双重的：\r\r。这应该不会使任何这些失败的权利？

解决方案

已经有 nl2br（） 函数替换 插入 < br> 在换行符之前的标签：

示例（ codepad ）：

 <？php 
 //不会工作
 $ desc ='第一行\两行'; 
 //应该工作
 $ desc2 =第一行\在线两位; 
 
 echo nl2br（$ desc）; 
 echo'< br />'; 
 echo nl2br（$ desc2）; 
？> 
  

但是，如果它仍然无效，请确保文本 $ desciption

这是因为单引号不会'扩展'转义序列，如 \\\
与双引号字符串进行比较。来自PHP文档的引用：

注意：与双引号和heredoc语法，变量和转义序列不同特殊字符出现在单引号字符串中时不会被展开。

Trying to simply replace some new lines. Have tried 3 different ways and I get no change:

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

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

解决方案

There is already nl2br() function that replaces 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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