79 lines
2.5 KiB
Markdown
79 lines
2.5 KiB
Markdown
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# Introduction
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zend-config is designed to simplify access to configuration data within applications. It provides
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a nested object, property-based user interface for accessing this configuration data within
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application code. The configuration data may come from a variety of formats supporting hierarchical
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data storage. Currently, zend-config provides adapters that read and write configuration data
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stored in INI, JSON, YAML, and XML files.
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## Using Reader Classes
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Normally, users will use one of the [reader classes](reader.md) to read a
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configuration file, but if configuration data is available in a PHP array, one
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may simply pass the data to `Zend\Config\Config`'s constructor in order to
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utilize a simple object-oriented interface:
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```php
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// An array of configuration data is given
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$configArray = [
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'webhost' => 'www.example.com',
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'database' => [
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'adapter' => 'pdo_mysql',
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'params' => [
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'host' => 'db.example.com',
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'username' => 'dbuser',
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'password' => 'secret',
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'dbname' => 'mydatabase',
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],
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],
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];
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// Create the object-oriented wrapper using the configuration data
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$config = new Zend\Config\Config($configArray);
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// Print a configuration datum (results in 'www.example.com')
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echo $config->webhost;
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```
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As illustrated in the example above, `Zend\Config\Config` provides nested object
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property syntax to access configuration data passed to its constructor.
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Along with the object-oriented access to the data values, `Zend\Config\Config`
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also has a `get()` method that accepts a default value to return if the data
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element requested doesn't exist in the configuration array. For example:
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```php
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$host = $config->database->get('host', 'localhost');
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```
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## Using PHP Configuration Files
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PHP-basd configuration files are often recommended due to the speed with which
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they are parsed, and the fact that they can be cached by opcode caches.
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The following code illustrates how to use PHP configuration files:
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```php
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// config.php
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return [
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'webhost' => 'www.example.com',
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'database' => array(
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'adapter' => 'pdo_mysql',
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'params' => [
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'host' => 'db.example.com',
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'username' => 'dbuser',
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'password' => 'secret',
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'dbname' => 'mydatabase',
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],
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],
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];
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```
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```php
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// Consumes the configuration array
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$config = new Zend\Config\Config(include 'config.php');
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// Print a configuration datum (results in 'www.example.com')
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echo $config->webhost;
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```
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