php读取文件内容至字符串并加以处理的代码

/*
*读取文件内容至字符串中，同时去除换行、行首行尾空格。
*/
header("Content-type: text/html; charset=utf-8");
echo preg_replace('/((\s)*(\n)+(\s)*)/i',',',file_get_contents('./file.php'));//End_php
//输出:
//aaaa,bbbb,cccc,dddd,eeee,ffff,gggg,hhhh,iiii,jjjj,kk kk,ll ll
?>

file.php内容： aaaa

cccc dddd eeee ffff gggg hhhh iiii jjjj kk kk ll ll

//file.php替换空格(x)、Tab(T)效果 aaaa

TTTT cccc ddddT xxxxxxxxxxxT eeeexxxxxxxxxx ffff gggg hhhhxxxxxxxx xxxxxxxxiiii xxxxxxxxjjjjxxxxxxx kkxxxkkTT xxxxllxxllTT Txxxxxxxxxx TTTxx