PEAR:PHP extension and application library_PHP tutorial

1. Introduction to PEAR

PEAR: PHP Extension and Application Repository, PHP extension and application library. (Suddenly I want to eat pears) Pear's mission: Provide reusable components and lead PHP innovation. Packages and applications that provide PHP code. Pear is also a PHP code standard, making PHP code easier to read and improving reusability.

2. PEAR installation

When installing php, pear will be installed by default, in the bin directory. Use the version parameter to view the version number.

$ ./pear version

PEAR Version: 1.9.4
PHP Version: 5.4.26
Zend Engine Version: 2.4.0

Verify the include path of php The pear extension is installed under the include path of PHP.

$ ./pear config-get php_dir

/home/gang/php/lib/php

3. pear parameter

Running pear directly will output its parameters.

$ ./pear

Commands:
build                  Build an Extension From C Source
bundle                 Unpacks a Pecl Package
channel-add            Add a Channel
channel-alias          Specify an alias to a channel name
channel-delete         Remove a Channel From the List
...

Commonly used parameters: info View package information install installation package uninstall uninstall package list View locally installed packages remote-list View online packages
upgrade upgrade package config-show View config configuration

Check the usage of common parameters through help

$ ./pear help install

4. Install php package

For example, we need to install the LOG package

$ ./pear install LOG

After successful operation, Log.php and Log directories, as well as the doc directory will be generated in the php/lib directory. There are usage examples and instructions under doc/Log.
Upgrade LOG package:

./pear upgrade LOG

5. Use of installation package

The Log package we installed above. Just require it in the application's php code.

<?php

require_once 'Log.php';

$logger = Log::singleton('error_log', PEAR_LOG_TYPE_SYSTEM, 'ident');
for ($i = 0; $i < 10; $i++) { 
    $logger->log("Log entry $i");
}

6. Commonly used php packages

PHPDoc – Document Extraction Tool
PHPUnit – unit testing framework
DB – database package
All can be viewed using the command:

$ ./pear remote-list

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