This function returns a connection resource on success, zero on
failure.
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.
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