php pdo what does it mean

In PHP, pdo is a lightweight, consistent interface defined by PHP for accessing databases; it provides a data access abstraction layer so that no matter what database you use, you can use the same function Executing queries and obtaining data greatly simplifies database operations and can shield differences between different databases.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

What is PDO

PDO is the abbreviation of PHP Date Object (PHP Data Object). It is a lightweight and consistent interface defined by PHP for accessing the database. It provides a data access abstraction layer so that no matter you use Any database can query and obtain data through the same function, which greatly simplifies the operation of the database and can shield the differences between different databases.

PDO is released together with PHP5.1 version. Using PDO can easily develop cross-database programs and transplant between different databases. Currently, the databases supported by PDO include Firebird, FreeTDS, Interbase, and MySQL. , SQL Server, ODBC, Oracle, Postgre SQL, SQLite and Sybase, etc.

With PDO, you no longer need to use a series of functions of mysqli_*. You only need to use the methods in PDO to operate the database.

Characteristics of PDO

We can think of PDO as a "database access abstraction layer", which serves to unify the access interfaces of various databases. Compared with MySQL and MSSQL function libraries, PDO makes cross-database use more friendly, and compared with ADODB and MDB2, PDO is more efficient.

PDO will unify the common features of various databases through a lightweight, clear, and convenient function to achieve the greatest degree of abstraction and compatibility of PHP scripts.

PDO draws on lessons learned from successful and failed extensions to existing databases and leverages the latest features of PHP5 to easily interact with a variety of databases.

The PDO extension is modular and can load drivers for user database backends at runtime without having to recompile or reinstall the entire PHP program. For example, the PDO_MySQL extension implements the MySQL database API instead of the PDO extension, and it also has drivers for Oracle, Postgre SQL, ODBC, and Firebird.

Enable PDO

PDO is distributed with PHP5.1 and is included in PHP5.1 by default. Because PDO requires support from PHP5's core object-oriented features, it cannot be used in versions prior to PHP5.0.

By default, PDO is turned on in PHP, but to enable support for a database driver, corresponding configuration operations are still required.

Taking the Windows system as an example, the PDO-related configuration information in the configuration file php.ini is as follows:

;extension=pdo_firebird
;extension=php_pdo_mysql.dll
;extension=pdo_oci
;extension=pdo_odbc
;extension=pdo_pgsql
;extension=pdo_sqlite

Tip: To enable the corresponding configuration, you only need to remove the semicolon;, and then restart the Apache server.

To verify whether the relevant configuration is opened successfully, you only need to execute the phpinfo() function and search for the name of the configuration in the output page. If it exists, it means the opening is successful, as shown in the following figure:

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