$content=str_replace("\n","",$content);
echo $content;
第二种写法:
str_replace("\r\n","",$str);
第三种写法:
$content=preg_replace("/\s/","",$content);
echo $content;
附:
首先说说\n,\r,\t
\n 软回车:
在Windows 中表示换行且回到下一行的最开始位置
在Linux、unix 中只表示换行,但不会回到下一行的开始位置。
\r 软空格:
在Linux、unix 中表示返回到当行的最开始位置。
在Mac OS 中表示换行且返回到下一行的最开始位置,相当于Windows 里的 \n 的效果。
\t 跳格(移至下一列)
几点说明:
它们在双引号或定界符表示的字符串中有效,在单引号表示的字符串中无效。
\r\n 一般一起用,用来表示键盘上的回车键(Linux,Unix中),也可只用 \n(Windwos中),在Mac OS中用\r表示回车!
\t表示键盘上的“TAB”键。
文件中的换行符号:
windows : \n
linux,unix: \r\n
实例代码:
复制代码 代码如下:
//php 不同系统的换行
//不同系统之间换行的实现是不一样的
//linux 与unix中用 /n
//MAC 用 /r
//window 为了体现与linux不同 则是 /r/n
//所以在不同平台上 实现方法就不一样
//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);
?>

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