How to change the php.ini file to support the pdo abstraction layer

Method: 1. Open the configuration file "php.ini"; 2. Search for PDO-related configuration information such as "pdo_firebird", "pdo_oci", "pdo_odbc", "pdo_pgsql", etc., and separate the points in front of the configuration items. Remove the ";"; 3. Restart the Apache server.

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 what database you use, you can perform queries and obtain data through the same function, which greatly simplifies database operations and can shield 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.

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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