what is php extension

## PHP ExtensionThe English name is PHP Extension and Application Repository, referred to as pear (hereinafter referred to as pear), and the Chinese full name is PHP Extension and Application Repository. To create a tool similar to Perl CPAN archives, Stig S. Bakken founded the PEAR project in 1999. The following is a detailed introduction to php extensions.

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PHP video tutorial## PEAR is the PHP Extension and Application Repository )abbreviation of. It is a code repository for PHP extensions and applications. Simply put, PEAR is to PHP what CPAN (Comprehensive Perl Archive Network) is to Perl.

The basic goal of PEAR is to develop into a knowledge base for PHP extension and library code, and the most ambitious goal of this project is to try to define a standard that will help developers write portable, reusable Reused code.

There are already some documents about this project on the Internet. For example, some initial information can already be found in the official PHP manual, and more information will be added soon.

To a large extent, PEAR is still a work in progress. There will be significant development of the PEAR installer and PEAR website in the coming months. There has been a lot of discussion on the PHP Core Developer mailing list to use PEAR to manage the growing number of C extensions in the next PHP version, and to use the PEAR installer as a front-end tool for users to download and install extensions into PHP.

Software installation Installing PEAR is actually very simple. Since the PEAR library is updated very quickly, what I want to introduce below is how to install the latest CVS version of PEAR.

Note: PEAR’s internal knowledge base system may change in the future. For now, PEAR packages and libraries are saved to the same CVS tree as PHP itself, which may cause problems in managing both the PHP main repository and developers, and PEAR's own repository and developers. It can be expected that in the near future, PEAR will be separated into independent modules/trees. This module already exists, but most of the packages are still in their old locations.

If you have never heard of CVS, please take a look at the relevant information. CVS is not a particularly difficult technology to use, but it does take some time to become familiar with it.

Assuming that the standard CVS client software has been installed on your machine, next you should:

Open a terminal window (rxvt, xterm, or other).

Enter the following command:

cvs -z3 -d :pserver:cvsread@cvs.php.net:/repository login
Password: [在这里输入“phpfi”作为密码]
cvs -z3 -d :pserver:cvsread@cvs.php.net:/repository co php4
[这个命令将创建新的目录php4]
cd php4
cvs -z3 -d :pserver:cvsread@cvs.zend.com:/repository login
Password: [这里输入密码zend]
cvs -z3 -d :pserver:cvsread@cvs.zend.com:/repository co Zend TSRM
[该命令将在php4下面创建两个新目录，名字为“Zend”和“TSRM”]
./buildcon

This is the entire installation process. Running buildconf will create the standard configure script, which can be used to set PHP options. In a default installation, PEAR will be automatically installed under /usr/local/lib/php. However, you can also manually construct each file by entering as a superuser, going to the php4/pear directory, and executing make install-su.

In addition, you should also add the PEAR root directory to the include_path of the php.ini file. The default directory should be /usr/local/lib/php, but it may be in another location if you change the options manually.

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