unlink()

(PHP 4, PHP 5, PHP 7)

删除文件

说明

删除$filename。和 Unix C 的 unlink()函数相似。发生错误时会产生一个E_WARNING级别的错误。

参数

文件的路径。

Note:在 PHP 5.0.0中增加了对上下文（Context）的支持。有关上下文（Context）的说明参见Streams。

返回值

成功时返回TRUE，或者在失败时返回FALSE。

更新日志

范例

基本的unlink()用法

参见

• rmdir() 删除目录

This will delete all files in a directory matching a pattern in one line of code. 

Deleted a large file but seeing no increase in free space or decrease of disk usage? Using UNIX or other POSIX OS?
The unlink() is not about removing file, it's about removing a file name. The manpage says: ``unlink - delete a name and possibly the file it refers to''.
Most of the time a file has just one name -- removing it will also remove (free, deallocate) the `body' of file (with one caveat, see below). That's the simple, usual case.
However, it's perfectly fine for a file to have several names (see the link() function), in the same or different directories. All the names will refer to the file body and `keep it alive', so to say. Only when all the names are removed, the body of file actually is freed.
The caveat:
A file's body may *also* be `kept alive' (still using diskspace) by a process holding the file open. The body will not be deallocated (will not free disk space) as long as the process holds it open. In fact, there's a fancy way of resurrecting a file removed by a mistake but still held open by a process...

unlink($fileName); failed for me .
Then i tried using the realpath($fileName) function as 
unlink(realpath($fileName)); it worked 
just posting it , in case if any one finds it useful .

I have been working on some little tryout where a backup file was created before modifying the main textfile. Then when an error is thrown, the main file will be deleted (unlinked) and the backup file is returned instead.
Though, I have been breaking my head for about an hour on why I couldn't get my persmissions right to unlink the main file.
Finally I knew what was wrong: because I was working on the file and hadn't yet closed the file, it was still in use and ofcourse couldn't be deleted :)
So I thought of mentoining this here, to avoid others of making the same mistake:

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