Why is my `nl2br()` function not replacing newlines with ``?

Replacing Newlines or rn with
: A Troubleshooting Guide

Seeking to replace newlines with
, you attempted various approaches utilizing preg_replace(), str_replace(), and nl2br() but encountered unexpected behavior. Deeming double newlines (rr) as an unlikely cause for failure, you sought clarification.

Solution:

As highlighted in the response, the recommended method for converting newlines to
is using the nl2br() function. However, it's crucial to note that it inserts
tags before newline characters, not replacing them.

Example:

<code class="php">// Will not work
$desc = 'Line one\nline two';
// Should work
$desc2 = "Line one\nline two";

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

Additional Considerations:

If nl2br() still fails to operate as intended, verify that the $desciption text is enclosed in double quotes.

Reason:

Single quotes do not expand escape sequences, such as n, while double-quoted strings do. This discrepancy can lead to unexpected behavior.

Documentation Quote:

"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."

The above is the detailed content of Why is my `nl2br()` function not replacing newlines with ``?. For more information, please follow other related articles on the PHP Chinese website!