mysql_pconnect(3) [php man page]
MYSQL_PCONNECT(3) 1 MYSQL_PCONNECT(3) mysql_pconnect - Open a persistent connection to a MySQL server SYNOPSIS
Warning This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include: omysqli_connect(3) with p: host prefix o PDO::__construct with PDO::ATTR_PERSISTENT as a driver option resource mysql_pconnect ([string $server = ini_get("mysql.default_host")], [string $username = ini_get("mysql.default_user")], [string $password = ini_get("mysql.default_password")], [int $client_flags]) DESCRIPTION
Establishes a persistent connection to a MySQL server. mysql_pconnect(3) acts very much like mysql_connect(3) 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(3) will not close links established by mysql_pconnect(3)). This type of link is therefore called 'persistent'. o $server - The MySQL server. It can also include a port number. e.g. "hostname:port" or a path to a local socket e.g. ":/path/to/socket" for the localhost. If the PHP directive mysql.default_host is undefined (default), then the default value is 'localhost:3306' o $username - The username. Default value is the name of the user that owns the server process. o $password - The password. Default value is an empty password. o $client_flags - The $client_flags parameter can be a combination of the following constants: 128 (enable LOAD DATA LOCAL handling), MYSQL_CLIENT_SSL, MYSQL_CLIENT_COMPRESS, MYSQL_CLIENT_IGNORE_SPACE or MYSQL_CLIENT_INTERACTIVE. Returns a MySQL persistent link identifier on success, or FALSE on failure. +--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.5.0 | | | | | | | This function will generate an E_DEPRECATED | | | error. | | | | +--------+---------------------------------------------------+ Note Note, that these kind of links only work if you are using a module version of PHP. See the Persistent Database Connections section for more information. Warning Using persistent connections can require a bit of tuning of your Apache and MySQL configurations to ensure that you do not exceed the number of connections allowed by MySQL. Note You can suppress the error message on failure by prepending a @ to the function name. mysql_connect(3), Persistent Database Connections. PHP Documentation Group MYSQL_PCONNECT(3)
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MYSQL_CONNECT(3) 1 MYSQL_CONNECT(3) mysql_connect - Open a connection to a MySQL Server SYNOPSIS
Warning This extension is deprecated as of PHP 5.5.0, and will be removed in the future. Instead, the MySQLi or PDO_MySQL extension should be used. See also MySQL: choosing an API guide and related FAQ for more information. Alternatives to this function include: omysqli_connect(3) o PDO::__construct resource mysql_connect ([string $server = ini_get("mysql.default_host")], [string $username = ini_get("mysql.default_user")], [string $password = ini_get("mysql.default_password")], [bool $new_link = false], [int $client_flags]) DESCRIPTION
Opens or reuses a connection to a MySQL server. o $server - The MySQL server. It can also include a port number. e.g. "hostname:port" or a path to a local socket e.g. ":/path/to/socket" for the localhost. If the PHP directive mysql.default_host is undefined (default), then the default value is 'localhost:3306'. In SQL safe mode, this parameter is ignored and value 'localhost:3306' is always used. o $username - The username. Default value is defined by mysql.default_user. In SQL safe mode, this parameter is ignored and the name of the user that owns the server process is used. o $password - The password. Default value is defined by mysql.default_password. In SQL safe mode, this parameter is ignored and empty password is used. o $new_link - If a second call is made to mysql_connect(3) with the same arguments, no new link will be established, but instead, the link identifier of the already opened link will be returned. The $new_link parameter modifies this behavior and makes mysql_connect(3) always open a new link, even if mysql_connect(3) was called before with the same parameters. In SQL safe mode, this parameter is ignored. o $client_flags - The $client_flags parameter can be a combination of the following constants: 128 (enable LOAD DATA LOCAL handling), MYSQL_CLIENT_SSL, MYSQL_CLIENT_COMPRESS, MYSQL_CLIENT_IGNORE_SPACE or MYSQL_CLIENT_INTERACTIVE. Read the section about "MySQL client constants" for further information. In SQL safe mode, this parameter is ignored. Returns a MySQL link identifier on success or FALSE on failure. +--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.5.0 | | | | | | | This function will generate an E_DEPRECATED | | | error. | | | | | 4.3.0 | | | | | | | Added the $client_flags parameter. | | | | | 4.2.0 | | | | | | | Added the $new_link parameter. | | | | +--------+---------------------------------------------------+ Example #1 mysql_connect(3) example <?php $link = mysql_connect('localhost', 'mysql_user', 'mysql_password'); if (!$link) { die('Could not connect: ' . mysql_error()); } echo 'Connected successfully'; mysql_close($link); ?> Example #2 mysql_connect(3) example using hostname:port syntax <?php // we connect to example.com and port 3307 $link = mysql_connect('example.com:3307', 'mysql_user', 'mysql_password'); if (!$link) { die('Could not connect: ' . mysql_error()); } echo 'Connected successfully'; mysql_close($link); // we connect to localhost at port 3307 $link = mysql_connect('127.0.0.1:3307', 'mysql_user', 'mysql_password'); if (!$link) { die('Could not connect: ' . mysql_error()); } echo 'Connected successfully'; mysql_close($link); ?> Example #3 mysql_connect(3) example using ":/path/to/socket" syntax <?php // we connect to localhost and socket e.g. /tmp/mysql.sock // variant 1: omit localhost $link = mysql_connect(':/tmp/mysql', 'mysql_user', 'mysql_password'); if (!$link) { die('Could not connect: ' . mysql_error()); } echo 'Connected successfully'; mysql_close($link); // variant 2: with localhost $link = mysql_connect('localhost:/tmp/mysql.sock', 'mysql_user', 'mysql_password'); if (!$link) { die('Could not connect: ' . mysql_error()); } echo 'Connected successfully'; mysql_close($link); ?> Note Whenever you specify "localhost" or "localhost:port" as server, the MySQL client library will override this and try to connect to a local socket (named pipe on Windows). If you want to use TCP/IP, use "127.0.0.1" instead of "localhost". If the MySQL client library tries to connect to the wrong local socket, you should set the correct path as "" in your PHP configuration and leave the server field blank. Note The link to the server will be closed as soon as the execution of the script ends, unless it's closed earlier by explicitly calling mysql_close(3). Note You can suppress the error message on failure by prepending a @ to the function name. Note Error "Can't create TCP/IP socket (10106)" usually means that the variables_order configure directive doesn't contain character E. On Windows, if the environment is not copied the SYSTEMROOT environment variable won't be available and PHP will have problems load- ing Winsock. mysql_pconnect(3), mysql_close(3). PHP Documentation Group MYSQL_CONNECT(3)