PHP gets line breaks in form textarea data_PHP tutorial

Test page code:

Copy code The code is as follows:

< title>PHP gets line break problem in form area data


$content=empty($_POST[' content'])?null:trim($_POST['content']);
if(!empty($content))echo str_replace("r",'rl',nl2br($content));
echo "r".'
----------Separating line----------------------'." r";
if(!empty($content))echo str_replace("n",'nl',nl2br($content));
echo "n".'
-- --------Separating line---------------------'."n";
if(!empty($content)) echo str_replace("r",'rl',str_replace("n",'nl',nl2br($content)));
echo "r".'
------ ----Separating line----------------------
'."n";
echo 'hello'."n ".'boys!';
echo 'hello'."r".'boys!';
?>

< ;input type="submit" value="Submit" />

After opening it in the browser, enter in the form:

After pressing submit, the results displayed in the browser are as follows:

You can see the following results in the notepad:

It can be seen from the above results:

1. The PHP function nl2br() inserts the HTML newline character before each new line (rn) in the string:
;
2. The newline under Windows is (rn);
3. In Notepad, r or n have the function of line break;

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