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    <p>Here is a quick example that might help you with your problem. Let's say I wanted to fetch an array of all my <strong><em>"Customer"</em></strong> data from my <strong><em>"customers"</em></strong> table, How would I successfully complete this task?</p> <p>For this example I will be using two files:</p> <ul> <li><strong>db.class.php:</strong> This class will hold all of the database functions.</li> <li><strong>init.php:</strong> This file will require the database class to fetch all of the customer rows.</li> </ul> <p><strong>db.class.php</strong> </p> <pre><code>&lt;?php class DB { private $host; private $user; private $pw; private $db; public function __construct($db_config) { $this-&gt;host = $db_config['host']; $this-&gt;user = $db_config['user']; $this-&gt;pw = $db_config['pw']; $this-&gt;db = $db_config['db']; } public function open() { /* establish link */ $link = new mysqli($this-&gt;host, $this-&gt;user, $this-&gt;pw, $this-&gt;db); if (!$link) { return false; } $link-&gt;autocommit(TRUE); return $link; } public function getRows($table) { /* establish database connection */ $db = self::open(); /* execute query */ $result = $db-&gt;query("SELECT * FROM $table"); /* fetch rows */ while ($row = $result-&gt;fetch_array()) { $rows[] = $row; } return $rows; } } </code></pre> <p><strong>init.php</strong></p> <pre><code>&lt;?php require 'db.class.php'; /* database config */ $db_config = array( 'host' =&gt; '', 'user' =&gt; '', 'pw' =&gt; '', 'db' =&gt; '' ); /* input table */ $table = 'cust'; $db = new DB($db_config); $rows = $db-&gt;getRows($table); foreach ($rows as $key =&gt; $value) { echo 'Row: '.$key." : ".$value."&lt;br /&gt;"; } ?&gt; </code></pre>
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    1. POConnecting to Database Using PHP OOP
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    1. COWhy not `DB extends MySQLi {...}` and why hardcoding host, passwd,... ?
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    2. COSaxoier: I have used both MySQL and MongoDB with the same web app. My DB class can contain functions for both systems. If I extended MySQLi to the "DB" class will that limit the class to MySQLi?
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    3. COPlease use names that make sense. Your `Customer` class does not really represent a customer but a database retrieval mechanism for many customers. It is not semantically correct in OO terms.
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