php换行替换的方法：1、使用str_replace来替换换行，语法如“str_replace(array("\\r\\n", "\\r", "\\n"), "", $str);”；2、使用正则表达式替换；3、使用php定义好的变量替换。
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PHP中替换换行符的几种方法：
第一种：
代码如下:
<?php
?$str="this is a test \\n";
$patten = array("\\r\\n", "\\n", "\\r");
?//先替换掉\\r\\n,然后是否存在\\n,最后替换\\r
$str=str_replace($order, "", $str);
?>
//php 有三种方法来解决
//1、使用str_replace 来替换换行
$str = str_replace(array("\\r\\n", "\\r", "\\n"), "", $str);
//2、使用正则替换
$str = preg_replace('//s*/', '', $str);
//3、使用php定义好的变量 （建议使用）
$str = str_replace(PHP_EOL, '', $str);代码如下:
/*
* 获得用户操作系统的换行符,\\n
* @access public
* @return string
*/
function get_crlf()
{
if (stristr($_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';//权重大一点
}
return $the_crlf;
}注意：在前台页面显示的时候，用nl2br使换行变成
第二种实例说明：
发现一个有趣的事情：
$text="aaaa ccc"; $text=str_replace('\\n‘,"",$text); $text=str_replace('\\r‘,"",$text); $text=str_replace('\\r\\n‘,"",$text);
正常来说，上面的代码应该可以替换换行符了吧
但是事实上却是不可以！
很郁闷，试了很多次，就是不起作用。
最后改成这样
代码如下:
$text=str_replace("\\n","",$text);
$text=str_replace("\\r","",$text);
$text=str_replace("\\r\\n","",$text);居然一切OK了~~，原来是双引号，单引号的问题！！
双引号 比单引号效率差点，因为双引号在被php解析的过程中 ，还会判断里面会不会有变量，单引号就不会有这个判断，故而一般来讲，没涉及到变量的情况下，我都会用单引号，没想到这次替换换行符，用单引号居然不行·····
最后写成一句话
代码如下:
$order = array("\\r\\n", "\\n", "\\r");
$replace = '';
$text=str_replace($order, $replace, $text);这样即可替换换行符！
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