第一種：

復制代碼 代碼如下:

<?php
?$str="this is a test /n";
$patten = array("/r/n", "/n", "/r");
?//先替換掉/r/n,然后是否存在/n,最后替換/r
$str=str_replace($order, "", $str);
?>

復制代碼 代碼如下:

/*
* 獲得用戶操作系統的換行符,/n
* @access public
* @return string
*/
function get_crlf()
{
if (stristr($_SERVER['HTTP_USER_AGENT'], 'Win'))
{
$the_crlf = '/r/n';
}
elseif (stristr($_SERVER['HTTP_USER_AGENT'], 'Mac'))
{
$the_crlf = '/r'; // for old MAC OS
}
else
{
$the_crlf = '/n';//權重大一點
}
return $the_crlf;
}

復制代碼 代碼如下:

$text=str_replace("/n","",$text);
$text=str_replace("/r","",$text);
$text=str_replace("/r/n","",$text);

復制代碼 代碼如下:

$order = array("/r/n", "/n", "/r");
$replace = '';
$text=str_replace($order, $replace, $text);