(PHP 4, PHP 5, PHP 7, PHP 8)
dba_popen — Open database persistently
dba_popen() establishes a persistent database instance
for path with mode using
handler.
pathCommonly a regular path in your filesystem.
mode
It is r for read access, w for
read/write access to an already existing database, c
for read/write access and database creation if it doesn't currently exist,
and n for create, truncate and read/write access.
handler
The name of the handler which
shall be used for accessing path. It is passed
all optional parameters given to dba_popen() and
can act on behalf of them.
argsOptional string parameters which are passed to the driver.
The cdb, cdb_make, flatfile,
inifile, qdbm and tcadb drivers
do not support additional parameters.
The db1, db2, db3,
db4, dbm, gdbm,
and ndbm drivers supports a single additional parameter $filemode,
which has the same meaning as the $mode parameter of chmod(),
and defaults to 0644.
The lmdb driver accepts two additional parameters. The first
allows to specify the $filemode (see description above), and the
second to specify the $mapsize, where the value should be a multiple
of the page size of the OS, or zero, to use the default mapsize. The $mapsize
parameter is supported as of PHP 7.3.14 and 7.4.2, respectively.
Returns a positive handle on success 或者在失败时返回 false.