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If you are new to PHP or just need to refresh your skills, this is the place to start. This series of tutorials will give you the basic knowledge you will need to create a simple PHP website.
PHP is a reflective programming language originally designed for producing dynamic web pages.[1] PHP is used mainly in server-side scripting, but can be used from a command line interface or in standalone graphical applications. Textual User Interfaces can also be created using ncurses.
Establishes 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'.
serverThe 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'
usernameThe username. Default value is the name of the user that owns the server process.
passwordThe password. Default value is an empty password.
client_flags
The client_flags parameter can be a combination
of the following constants:
MYSQL_CLIENT_SSL,
MYSQL_CLIENT_COMPRESS,
MYSQL_CLIENT_IGNORE_SPACE or
MYSQL_CLIENT_INTERACTIVE.
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.
Another Useful functions:
ref.pdo-mysql | ref.pdo-mysql.connection | ref.mysqli | ref.mysql | function.mysqli-warning-count | function.mysqli-use-result | function.mysqli-thread-safe | function.mysqli-thread-id | function.mysqli-store-result | function.mysqli-stmt-store-result | function.mysqli-stmt-sqlstate | function.mysqli-stmt-send-long-data | function.mysqli-stmt-result-metadata | function.mysqli-stmt-reset | function.mysqli-stmt-prepare | function.mysqli-stmt-param-count | function.mysqli-stmt-num-rows | function.mysqli-stmt-insert-id | function.mysqli-stmt-init | function.mysqli-stmt-get-warnings | function.mysqli-stmt-free-result | function.mysqli-stmt-field-count | function.mysqli-stmt-fetch | function.mysqli-stmt-execute | function.mysqli-stmt-error | function.mysqli-stmt-errno | function.mysqli-stmt-data-seek | function.mysqli-stmt-close | function.mysqli-stmt-bind-result | function.mysqli-stmt-bind-param | function.mysqli-stmt-attr-set | function.mysqli-stmt-attr-get | function.mysqli-stmt-affected-rows | function.mysqli-stat | function.mysqli-ssl-set | function.mysqli-sqlstate | function.mysqli-slave-query | function.mysqli-set-opt | function.mysqli-set-local-infile-handler | function.mysqli-set-local-infile-default | function.mysqli-set-charset | function.mysqli-server-init | function.mysqli-server-end | function.mysqli-send-query | function.mysqli-send-long-data | function.mysqli-select-db | function.mysqli-rpl-query-type | function.mysqli-rpl-probe | function.mysqli-rpl-parse-enabled | function.mysqli-rollback | function.mysqli-report | function.mysqli-real-query | function.mysqli-real-escape-string | function.mysqli-real-connect | function.mysqli-query | function.mysqli-prepare | function.mysqli-ping | function.mysqli-param-count | function.mysqli-options | function.mysqli-num-rows | function.mysqli-num-fields | function.mysqli-next-result | function.mysqli-multi-query | function.mysqli-more-results | function.mysqli-master-query | function.mysqli-kill | function.mysqli-insert-id | function.mysqli-init | function.mysqli-info | function.mysqli-get-warnings | function.mysqli-get-server-version | function.mysqli-get-server-info | function.mysqli-get-proto-info | function.mysqli-get-metadata | function.mysqli-get-host-info | function.mysqli-get-client-version | function.mysqli-get-client-info | function.mysqli-get-charset | function.mysqli-free-result | function.mysqli-field-tell | function.mysqli-field-seek | function.mysqli-field-count | function.mysqli-fetch | function.mysqli-fetch-row | function.mysqli-fetch-object | function.mysqli-fetch-lengths | function.mysqli-fetch-fields | function.mysqli-fetch-field | function.mysqli-fetch-field-direct | function.mysqli-fetch-assoc | function.mysqli-fetch-array | function.mysqli-execute | function.mysqli-escape-string | function.mysqli-error | function.mysqli-errno | function.mysqli-enable-rpl-parse | function.mysqli-enable-reads-from-master | function.mysqli-embedded-server-start | function.mysqli-embedded-server-end | function.mysqli-dump-debug-info | function.mysqli-disable-rpl-parse | function.mysqli-disable-reads-from-master | function.mysqli-debug | function.mysqli-data-seek | function.mysqli-connect | function.mysqli-connect-error | function.mysqli-connect-errno | function.mysqli-commit | function.mysqli-close | function.mysqli-client-encoding | function.mysqli-character-set-name | function.mysqli-change-user | function.mysqli-bind-result | function.mysqli-bind-param | function.mysqli-autocommit | function.mysqli-affected-rows | function.mysql-unbuffered-query | function.mysql-thread-id | function.mysql-tablename | function.mysql-stat | function.mysql-select-db | function.mysql-result | function.mysql-real-escape-string | function.mysql-query | function.mysql-ping | function.mysql-pconnect | function.mysql-num-rows | function.mysql-num-fields | function.mysql-list-tables | function.mysql-list-processes | function.mysql-list-fields | function.mysql-list-dbs | function.mysql-insert-id | function.mysql-info | function.mysql-get-server-info | function.mysql-get-proto-info | function.mysql-get-host-info | function.mysql-get-client-info | function.mysql-free-result | function.mysql-field-type | function.mysql-field-table | function.mysql-field-seek | function.mysql-field-name | function.mysql-field-len | function.mysql-field-flags | function.mysql-fetch-row | function.mysql-fetch-object | function.mysql-fetch-lengths | function.mysql-fetch-field | function.mysql-fetch-assoc | function.mysql-fetch-array | function.mysql-escape-string | function.mysql-error | function.mysql-errno | function.mysql-drop-db | function.mysql-db-query | function.mysql-db-name | function.mysql-data-seek | function.mysql-create-db | function.mysql-connect | function.mysql-close | function.mysql-client-encoding | function.mysql-change-user | function.mysql-affected-rows |
PHP is a widely-used general-purpose scripting language that is especially suited for Web development and can be embedded into HTML. If you are new to PHP and want to get some idea of how it works, try the introductory tutorial. After that, check out the online manual, and the example archive sites and some of the other resources available in the links section.