PHP in the form input box line break enter replace _php tutorial

Source: Internet
Author: User
PHP in the form input box to replace the return of some of the methods summarized, a friend who needs to refer to this article.
The code is as follows Copy Code


? $str = "This is a test n";
$patten = Array ("RN", "n", "R");
?//Replace RN First, then whether N is present, and the last replacement R
$str =str_replace ($order, "", $str);
?>

 

?//php there are three ways to solve

The code is as follows Copy Code

1. Use Str_replace to replace line breaks
$str = Str_replace (Array ("RN", "R", "N"), "", $str);

2. Use regular replacement
$str = preg_replace ('//s*/', ' ', $str);

3. Use PHP-defined variables (recommended)
$str = Str_replace (Php_eol, ", $STR);


?/*
* Get the user's operating system line break, n
* @access Public
* @return String
*/
function Get_crlf ()
{
if (Stristr ($_server[' http_user_agent '), ' Win ')
{
$the _crlf = ' RN ';
}
ElseIf (Stristr ($_server[' http_user_agent '), ' Mac ')
{
$the _crlf = ' R '; For-old MAC OS
}
Else
{
$the _crlf = ' n ';//Right is a big one.
}
return $the _crlf;
}

Test code

The code is as follows Copy Code




PHP Gets the line break problem in the form area data


$content =empty ($_post[' content ')? Null:trim ($_post[' content ');
if (!empty ($content)) echo str_replace ("R", ' RL ', NL2BR ($content));
echo "R". '
----------Split Line----------------------'. ' R ";
if (!empty ($content)) echo str_replace ("n", ' NL ', NL2BR ($content));
echo "n". '
----------Split Line----------------------'. ' n ";
if (!empty ($content)) echo str_replace ("R", ' RL ', Str_replace ("n", ' NL ', NL2BR ($content)));
echo "R". '
----------Split Line----------------------
'." n ";
echo ' Hello '. n ". ' Boys! ';
echo ' Hello '. R "." Boys! ';
?>



The 1.PHP function nl2br () inserts an HTML newline character before each new line (RN) in the string:
;
The line break under 2.Windows is (RN);
3. In Notepad, R or N has the function of line wrapping;

Note: When the foreground page is displayed, use NL2BR to change the line to

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