yaz_connect
Prepares for a connection to a Z39.50 server
Description
mixed yaz_connect(string $zurl, mixed $options = ?)
yaz_connect prepares for a connection to a
Z39.50 server.
This function is non-blocking and does not attempt to establish
a connection - it merely prepares a connect to be performed later when
yaz_wait is called.
Note:
The » YAZ proxy is a
freely available Z39.50 proxy.
Parameters
-
zurl
-
A string that takes the form host[:port][/database].
If port is omitted, port 210 is used. If database is omitted
Default is used.
-
options
-
If given as a string, it is treated as the Z39.50 V2 authentication
string (OpenAuth).
If given as an array, the contents of the array serves as options.
-
user
-
Username for authentication.
-
group
-
Group for authentication.
-
password
-
Password for authentication.
-
cookie
-
Cookie for session (YAZ proxy).
-
proxy
-
Proxy for connection (YAZ proxy).
-
persistent
-
A boolean. If true the connection is persistent; If false the
connection is not persistent. By default connections are persistent.
Note:
If you open a persistent connection, you won't be able to close
it later with yaz_close.
-
piggyback
-
A boolean. If true piggyback is enabled for searches; If false
piggyback is disabled. By default piggyback is enabled.
Enabling piggyback is more efficient and usually saves a
network-round-trip for first time fetches of records. However, a
few Z39.50 servers do not support piggyback or they ignore element
set names. For those, piggyback should be disabled.
-
charset
-
A string that specifies character set to be used in Z39.50
language and character set negotiation. Use strings such as:
ISO-8859-1, UTF-8,
UTF-16.
Most Z39.50 servers do not support this feature (and thus, this is
ignored). Many servers use the ISO-8859-1 encoding for queries and
messages. MARC21/USMARC records are not affected by this setting.
-
preferredMessageSize
-
An integer that specifies the maximum byte size of all records
to be returned by a target during retrieval. See the
» Z39.50 standard for more
information.
Note:
This option is supported in PECL YAZ 1.0.5 or later.
-
maximumRecordSize
-
An integer that specifies the maximum byte size of a single record
to be returned by a target during retrieval. This
entity is referred to as Exceptional-record-size in the
» Z39.50 standard.
Note:
This option is supported in PECL YAZ 1.0.5 or later.
Return Values
A connection resource on success, false on error.