Version Control - PHP

Let's now consider a variant of the example on the previous page, this one printing the value of a single configuration variable:

<?
// include class
require("patConfiguration.php");
// create patConfiguration 
object
$conf  = new patConfiguration;
// set config file locations
$conf->setConfigDir("config");
// 
read config file
$conf->parseConfigFile("config.xml");
// get configuration 
values
print_r($conf->getConfigValue("application.version"));
?>

In this case, since the getConfigValue() method receives the path and name of the configuration value to be retrieved, only that value is retrieved and printed.

Here's a more realistic example, this one using an XML configuration file containing MySQL database access parameters

<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<path name="mysql">
<configValue 
name="host"
type="string">localhost</configValue>
<configValue name="user" 
type="string">joe</configValue>
<configValue name="pass"
type="string">secret</configValue>
<configValue 
name="db" type="string">db456</configValue>
</path>
</configuration>

to open up and use a database connection.

<?
// include class
require("patConfiguration.php");
// create patConfiguration 
object
$conf = new patConfiguration;
// set config file locations
$conf->setConfigDir("config");
// 
read config file
$conf->parseConfigFile("config.xml");
// get and use configuration 
values
$connection = mysql_connect(
$conf->getConfigValue("mysql.host"), 
$conf->getConfigValue("mysql.user"), 
$conf->getConfigValue("mysql.pass")
) or die ("Unable to connect!");
mysql_select_db(
$conf->getConfigValue("mysql.db")
) 
or die ("Unable to select database!");
$query = "SELECT * FROM users";
$result 
= mysql_query($query) or die ("Error in query: $query. " .
mysql_error());
mysql_close($connection);
?>

>>> More PHP Articles          >>> More By Vikram Vaswani, (c) Melonfire

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