There is a good page in the php manual on the subject, in short mysql_pconnect() makes a persistent connection to the database which means a SQL link that do not close when the execution of your script ends.

test

mysql_connect()provides only for the databasenewconnection
while using mysql_pconnect , the function would first try to
find a (persistent) link that's already open with the same
host, username and password. If one is found, an identifier
for it will be returned instead of opening a new connection...
the connection to the SQL server will not be closed when the
execution of the script ends. Instead, the link will remain
open for future use.

That mean's You have a multiple page and same connection that time only one time connection create with pconnection.
other wise connection.

* mysql_pconnect() will try to find a connection that's already open, with the same host, username and password. If one is found, this will be returned instead of opening a new connection
* The connection will not be closed when the execution of the script ends (mysql_close() will not close connection opened by mysql_pconnect()). It will stay open for future use

mysql_pconnect ? Open a persistent connection to a MySQL server

mysql_pconnect() acts very much like mysql_connect() with two major differences.

First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection.

Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (mysql_close() will not close links established by mysql_pconnect()).

This type of link is therefore called 'persistent'.

mysql_connect ? Open a connection to a MySQL Server

Opens or reuses a connection to a MySQL server.

mysql_connection must be closed, we can't use this to connect another database means it is suitable for only one database accessing..
mysql_pconnect means opens a persistent connection, with this we use same host name, username, and password. we can access different databases at a time in the same program. we can't close the connection.

How can we close mysql_pconnect().

mysql_pconnect() acts very much like mysql_connect() with two major differences.

First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection.

Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (mysql_close() will not close links established by mysql_pconnect()).

This type of link is therefore called 'persistent'.

what will happen if we dont close the mysql_close()in mysql_connect(),then what is the difference between pconnct and connect.

msql-conect("local host","root","")
msql-select-db(xxx)

mysql_pconnect()

Mysql_connect-opens a connection to a mysql server

Mysql_Pconnect-open a persistent connection,which means a sql link that do not close when the execution
of your script ends.

mysql_pconnect=>Open a persistent connection to a MySQL server

mysql_pconnect() acts very much like mysql_connect() with two major differences.

First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection.

Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (mysql_close() will not close links established by mysql_pconnect()).

This type of link is therefore called 'persistent'.
more info:datamining.portalfever.com

mysql_pconnect=>Open a persistent connection to a MySQL server

mysql_pconnect() acts very much like mysql_connect() with two major differences.

First, when connecting, the function would first try to find a (persistent) link that's already open with the same host, username and password. If one is found, an identifier for it will be returned instead of opening a new connection.

Second, the connection to the SQL server will not be closed when the execution of the script ends. Instead, the link will remain open for future use (mysql_close() will not close links established by mysql_pconnect()).

This type of link is therefore called 'persistent'.
more info:datamining.portalfever.com

Mysql_Pconnect-open a persistent connection,which means a sql link that do not close when the execution
of your script ends.

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