How to Add Parameters to Your PHP Class (Constructor Tutorial)

Step 1: Create the __construct() function in your class

I named my class icdb. You can, however, name it anything you want.

class icdb {
	function __construct() {
	}
}

Step 2: Add parameters to the __construct() function

Add parameters to this like any other function.

function __construct($db_host, $db_user, $db_pass, $db_name) {
}

Step 3: Make your function

Do whatever you want. Here I am connecting to a database, obviously.

function __construct($db_host, $db_user, $db_pass, $db_name) {
	global $db_prefix;
	$link = mysql_connect($db_host, $db_user, $db_pass);
	$db = mysql_select_db($db_name);
	$this->prefix = $db_prefix;
	return $link;
}

Step 4: Add legacy support for PHP4

PHP 4 handles constructors differently. You must create a function with the name of your class within your class. Here, I must make the function icdb().

function icdb() {
	$this->__construct();
}

Final Code

You're now done! Here's all of the code put together.

class icdb {
	function icdb() {
		$this->__construct();
	}

	function __construct($db_host, $db_user, $db_pass, $db_name) {
		global $db_prefix;
		$link = mysql_connect($db_host, $db_user, $db_pass);
		$db = mysql_select_db($db_name);
		$this->prefix = $db_prefix;
		return $link;
	}
}

And to initialize the class:

$icdb = new icdb("localhost", "myUser", "myPass", "myDb");

And that's it! You are now connected to a database. Now all you need is to add functions to the class to work with the database!

You can use this method to add parameters to any PHP class.

This is my first tutorial, so please tell me if it doesn't make sense. :p