Creating a basic module "hello world" with menu items and permissions

ZenRays 02:08 Add Comment Edit

Module is a collection of files containing functionalities. In drupal to create a module, go to sites>all>modules and create a folder with the name custom. Inside that folder create another folder named as "Hello world" .

STEP 1: Creating .info file

In the "hello world" create a file named as helloworld.info
helloworld.info file should contain the following things
name = hello world module,
description = module created by xyz and
core = 7.x (if the drupal version is 7)

STEP 2 : Creating .module file

Create another file inside hello world folder named as helloworld.module

STEP 3 : Enabling the module

Go to your Drupal Site. Click on the modules. Scroll down, you'll find your module click on the checkbox and save it. By now we have created a module named "hello world".

STEP 4 : Setting up the Permission

The next thing to do with is setting up the permission. Permission can be created using hook_permission() function. Only the users with permission granted will have access to the page. To set up the permission, we have to include the following php code in the .module file.

<?php  
function helloworld_permission(){  
$permission = array();  
$permission = array  
(  
'view welcome message'=>array  
(  
'title'=>t('view welcome message for helloworld module')  
)         
);  
return $permission;  
}

This hook supplies the permission that the module defines. "title" provides the human-readable name of the permission to be shown on the page.

STEP 5 : Implementing menu items

To implement the menu items we should use hook_menu function. We have to include the following code below the hook_permission() function.

function helloworld_menu()  
{  
$items = array();

 
$items['welcome_message'] = array  
(  
'title'=>t("Welcome"),

 
'page callback'=>'helloworld_welcome',

 
'access arguments'=>array('view helloworld welcome message'),

  
'type'=>MENU_NORMAL_ITEM,

  
'menu_name'=>'main-menu',  
);  
}

$items['welcome_message'] = array( => This will create a URL welcome_message.

title => It is the page title
page callback => It is the function that will be called when the page is accessed
access argument => It is the key for an array which has permission for the current user to access the page. In this example welcome_message is the page.
type => MENU_NORMAL_ITEM => It is the normal menu item which is shown in menu and breadcrumbs.

STEP 6 : Create a function for 'helloworld_welcome'

function helloworld_welcome()  
{  
return "heya!! How are you?";  
}

Finally clear the cache and you'll be able to see a menu coming up. When you click on the welcome you'll see the message heya!!How are you?

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