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PHP mysql_pconnect() Function

PHP MySQL Reference Complete PHP MySQL Reference

Definition and Usage

The mysql_pconnect() function opens a persistent MySQL connection.

This function returns the connection on success, or FALSE and an error on failure. You can hide the error output by adding an '@' in front of the function name.

mysql_pconnect() is much like mysql_connect(), but with two major differences:

  • This function 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

Syntax

mysql_pconnect(server,user,pwd,clientflag)

Parameter Description
server Optional. Specifies the server to connect to (can also include a port number. e.g. "hostname:port" or a path to a local socket for the localhost). Default value is "localhost:3306"
user Optional. Specifies the username to log in with. Default value is the name of the user that owns the server process
pwd Optional. Specifies the password to log in with. Default is ""
clientflag Optional. Can be a combination of the following constants:
  • MYSQL_CLIENT_SSL - Use SSL encryption
  • MYSQL_CLIENT_COMPRESS - Use compression protocol
  • MYSQL_CLIENT_IGNORE_SPACE - Allow space after function names
  • MYSQL_CLIENT_INTERACTIVE - Allow interactive timeout seconds of inactivity before closing the connection

Tips and Notes

Tip: To establish a non-persistent MySQL connection, use mysql_connect() instead.

Example

<?php
$con = mysql_pconnect("localhost","mysql_user","mysql_pwd");
if (!$con)
  {
  die('Could not connect: ' . mysql_error());
  }
?>

PHP MySQL Reference Complete PHP MySQL Reference
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