How can line breaks in a text field be converted to pipes in PHP for email display?

To convert line breaks in a text field to pipes in PHP for email display, you can use the `nl2br()` function to convert the line breaks to HTML `<br>` tags, and then use `str_replace()` to replace the `<br>` tags with pipes. This will ensure that the line breaks are preserved in the email content but displayed as pipes.

// Sample text with line breaks
$text = "This is a sample text with
line breaks.";

// Convert line breaks to HTML <br> tags
$text_with_br = nl2br($text);

// Replace <br> tags with pipes
$text_with_pipes = str_replace('<br />', '|', $text_with_br);

echo $text_with_pipes;