php读取文件内容至字符串中，同时去除换行、空行、行首行尾空格（Zjmainstay原创）
复制代码 代码如下:
//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
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