yaz_connect
说明
mixed yaz_connect ( string zurl [, mixed options] )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.
注: The YAZ proxy is a freely available Z39.50 proxy.
参数
- 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.
注: 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.