Direct IO
PHP Manual

Direct IO 函数

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User Contributed Notes

php dot 5 dot gavinostlund at spamgourmet dot com 08-Dec-2007 01:36
You can manually build the dio extension for your version of PHP, or install an older version of PHP that still bundled dio.  It's not that hard to build it yourself, just a bit of a process, and it helps if you're on linux, and have a build environment... which I would assume you have if you are doing some kind of development that requires direct device I/O...  Just get the dio source from the cvs repo, compile it, and then add the extension to your php configuration...
tom at bitworks dot de 03-Nov-2007 02:41
to use mandatory locking on a linux system, the filesystem has to be well prepared.

# /etc/fstab: static file system information.
#
# <file system> <mount point>   <type>  <options>               <dump>  <pass>
/dev/hda1       /               ext3    errors=remount-ro,mand  0       1
/dev/hda2       none            swap    sw                      0       0
proc            /proc           proc    defaults                0       0
/dev/fd0        /floppy         auto    user,noauto             0       0
/dev/cdrom      /cdrom          iso9660 ro,user,noauto          0       0

For example here the ext3 partition has been prepared for mandatory locking. Otherwise no dio_function will work on the system.
richard d_0t cubek a_t example D0_t com 25-Sep-2007 10:13
IMPORTANT:

--enable-dio is NOT recognized as an option. After reporting a bug, i got following answer:

It is not bundled anymore. See http://pecl.php.net/dio to fetch the CVS version (being unmaintained, there is no release in pecl). Not a bug > bogus.

Direct IO
PHP Manual