其他非法字符都可以匹配，/和\，创建文件时提示“文件已存在，请重命名之后创建”，已经用了转义，这是basename的影响么？

basename($path, $suffix) 

Returns trailing name component of path

参数：

path string

A path.

On Windows, both slash (/) and backslash (\) are used as directory separator character. In other environments, it is the forward slash (/).

suffix string[optional]

If the name component ends in suffix this will also be cut off.

返回：

string the base name of the given path.  

怎么解决/和\匹配问题？