在PHP和CodeIgniter中不使用nl2br打印新行

Question

I am trying to solve a new line issue in CodeIgniter. My variable is set as below

$ba='hi\r\nhello';

When I try to print it like this

echo nl2br($ba);

It's not converting \\r\\n to a new line. After a whole day of searching I found out that this is because my variable is with ' not "

I've also tried to use preg_replace but it's the same

preg_replace("/\r\n|\r|\n/",'<br/>',$ba);

But I can't change this so how do I fix this issue?

Thanks for helping out.

Answer 1

"\\n" is not the same as '\\n' ! This is your basic problem. You are not trying to replace what you think you are

"\\n" is converted in to a line feed or ASCII 13

'\\n' is the character \\ then the character n

$ba='hi\r\nhello';
$ba=str_replace('\r\n','<br>',$ba);

echo $ba; // hi<br>hello

to use a regular expression:

as \\ is an escape character you need to triple it:

$ba=preg_replace('#\\\\\\r\\\\\\n|\\\\\\r|\\\\\\n#','<br/>',$ba);