dbmopen
(PHP 4)
dbmopen — Opens a DBM database
说明
resource dbmopen
( string $filename
, string $flags
)
Opens the specified DBM database in the given mode.
参数
-
filename
-
The full-path filename of the DBM file to be opened
-
flags
-
The file open mode which is one of r,
n, c or w,
for read-only, new (implies read-write, and most likely will truncate
an already-existing database of the same name), create (implies
read-write, and will not truncate an already-existing database of the
same name) and read-write respectively.
返回值
Returns an identifier to be passed to the other DBM functions on
success, or FALSE on failure.
注释
Note:
If NDBM support is used, NDBM will actually create
filename.dir and filename.pag
files. GDBM only uses one file, as does the internal flat-file support,
and Berkeley DB creates a filename.db file.
Note that PHP does its own file locking in addition to any file locking
that may be done by the DBM library itself. PHP does not delete the
.lck files it creates. It uses these files simply as
fixed inodes on which to do the file locking. For more information on DBM
files, see your Unix man pages, or obtain
» GNU's GDBM.
Note: 当安全模式被激活时，PHP
将检查被操作的文件或者目录是否与正在执行的脚本有相同的 UID（所有者）。