php - How can I replace newline or with <br/>?

Question

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

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

Answer 1

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

Example (codepad):

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