{"id":856,"date":"2015-10-02T22:00:26","date_gmt":"2015-10-02T22:00:26","guid":{"rendered":"https:\/\/www.codexworld.com\/?p=856"},"modified":"2016-04-22T16:56:01","modified_gmt":"2016-04-22T16:56:01","slug":"drupal-custom-module-development-tutorial","status":"publish","type":"post","link":"https:\/\/www.codexworld.com\/drupal-custom-module-development-tutorial\/","title":{"rendered":"Drupal custom module development tutorial"},"content":{"rendered":"

The module helps to extend and customize Drupal functionality. Drupal have three kinds of modules, core, contributed and custom. In this tutorial, you can learn how to create your own module in Drupal 7. Our step by step guide helps beginners to make a drupal 7 module from scratch. If you are new to Drupal, you can read Drupal 7 installation and setup tutorial for beginners<\/a> first.
\nLet’s start the creation of your own Drupal module.<\/p>\n

Step 1) Creating module folder and files<\/h2>\n

<\/span> Choose a short name for your module. Module name must start with a letter, and it must contain only lower-case letters and underscores. For this example, we’ll choose “latest_posts” as module name.<\/p>\n

<\/span> Create a folder with module name (latest_posts) in sites\/all\/modules\/<\/code> directory.<\/p>\n

<\/span> Create a latest_posts.info<\/code> file in the module directory (sites\/all\/modules\/latest_posts\/<\/code>) for telling drupal about your module. latest_posts.info<\/code> file contains the meta information of your module and it is required for your module. Missing of this file your module will not appear in the module listing.<\/p>\n

sites\/all\/modules\/latest_posts\/latest_posts.info<\/code> file contains the following code:<\/p>\n

\r\nname = Latest Posts\r\ndescription = A block module that lists links to newly created posts developed by CodexWorld.\r\ncore = 7.x\r\n<\/pre>\n
<\/span> Create a module file (latest_posts.module<\/code>) into the module directory (sites\/all\/modules\/latest_posts\/<\/code>). <\/p>\n
    \n
  • <\/span> Module file has a name of the module directory name and an extension of .module.<\/li>\n
  • <\/span> Module file is a PHP file and begins with opening PHP tag.<\/li>\n
  • <\/span> Omit the closing (?>) tag for avoiding the runtime issues on the certain server.<\/li>\n<\/ul>\n
    For now sites\/all\/modules\/latest_posts\/latest_posts.module<\/code> file contains the following code:<\/p>\n
    <?php<\/pre>\n
    TEST<\/b>
    \n<\/span> Go to Modules<\/b> listing page and scroll down of the list, you’ll see the Latest Posts<\/b> module under the OTHER<\/b> category.<\/p>\n
    \"latest-post-drupal-custom-module-in-list-by-codexworld\"<\/div>\n
    Step 2) Declaring the help hook<\/h2>\n
    <\/span> Implement some hooks in latest_posts.module<\/code> file. Also, it is a very good idea to document about how your module works in comments.<\/p>\n
    \/**
     * @file
     * A block module that displays latest posts.
     *\/<\/span><\/pre>\n
    <\/span> Implement a help hook (hook_help). This hook provides help and additional information about your module. Create a function called latest_posts_help()<\/code> in latest_posts.module<\/code> file and place the following code.<\/p>\n
    \/**
     * Implements hook_help().
     *
     * Displays help and module information.\r\n
     *\/
    <\/span>function <\/span>latest_posts_help<\/span>(<\/span>$path<\/span>, <\/span>$arg<\/span>) {
        switch (<\/span>$path<\/span>) {
            case <\/span>\"admin\/help#latest_posts\"<\/span>:
                return <\/span>'<p>' <\/span>. <\/span>t<\/span>(<\/span>\"Displays links to newly created posts developed by CodexWorld\"<\/span>) . <\/span>'<\/p>'<\/span>;
                break;
        }
    }<\/span><\/pre>\n
    TEST<\/b>
    \n<\/span> Go to the Modules<\/b> listing page =><\/b> Check the checkbox to enable your module =><\/b> Click on Save configuration<\/b>.<\/p>\n
    \"enable-drupal-custom-module-in-list-by-codexworld\"<\/div>\n
    <\/span> Help<\/b> link would appear with your module. Help<\/b> link will redirect you to the module help page.<\/p>\n
    \"drupal-custom-module-help-link-by-codexworld\"<\/div>\n
    <\/span> Return to the Modules<\/b> listing page =><\/b> Uncheck the checkbox to disable your module =><\/b> Click on Save configuration<\/b>.<\/p>\n
    Step 3) Declaring the block<\/h2>\n
    <\/span> hook_block_info()<\/code> is used to define a block. Create latest_posts_block_info()<\/code> function in latest_posts.module<\/code> file and place the following code.<\/p>\n
    \/**
     * Implements hook_block_info().
     *\/
    <\/span>function <\/span>latest_posts_block_info<\/span>() {
        <\/span>$blocks<\/span>[<\/span>'latest_posts'<\/span>] = array(
            <\/span>\/\/ The name that will appear in the block list.
            <\/span>'info' <\/span>=> <\/span>t<\/span>(<\/span>'Latest posts'<\/span>),
            <\/span>\/\/ Default setting.
            <\/span>'cache' <\/span>=> <\/span>DRUPAL_CACHE_PER_ROLE<\/span>,
        );
        return <\/span>$blocks<\/span>;
    }<\/span><\/pre>\n
    TEST<\/b>
    \n<\/span> Go to the Modules<\/b> listing page =><\/b> Check the checkbox to enable your module =><\/b> Click on Save configuration<\/b>.<\/p>\n
    <\/span> Navigate to the Structure » Blocks<\/b>, scroll down to the bottom of the list. You’ll see your “Latest posts” block under the Disabled<\/b> section.<\/p>\n
    \"drupal-custom-module-block-by-codexworld\"<\/div>\n
    <\/span> Return to the Modules<\/b> listing page =><\/b> Uncheck the checkbox to disable your module =><\/b> Click on Save configuration<\/b>.<\/p>\n
    Step 4) Retrieving data<\/h2>\n
    <\/span> Now we’ll create a custom function to retrieve the newly created posts from the database. recent_posts_contents()<\/code> function retrieved the post which are created within last week. recent_posts_contents()<\/code> function would be the following.<\/p>\n
    \/**
     * Custom content function. 
     * 
     * Set beginning and end dates, retrieve the recent posts from the database
     *\/
    <\/span>function <\/span>recent_posts_contents<\/span>(){
        <\/span>\/\/Get today's date.
        <\/span>$today <\/span>= <\/span>getdate<\/span>();
        <\/span>\/\/Calculate the date a week ago.
        <\/span>$start_time <\/span>= <\/span>mktime<\/span>(<\/span>0<\/span>, <\/span>0<\/span>, <\/span>0<\/span>,<\/span>$today<\/span>[<\/span>'mon'<\/span>],(<\/span>$today<\/span>[<\/span>'mday'<\/span>] - <\/span>7<\/span>), <\/span>$today<\/span>[<\/span>'year'<\/span>]);
        <\/span>\/\/Get all posts from one week ago to the present.
        <\/span>$end_time <\/span>= <\/span>time<\/span>();
        
        <\/span>\/\/Use Database API to retrieve recent posts.
        <\/span>$query <\/span>= <\/span>db_select<\/span>(<\/span>'node'<\/span>, <\/span>'n'<\/span>)
          -><\/span>fields<\/span>(<\/span>'n'<\/span>, array(<\/span>'nid'<\/span>, <\/span>'title'<\/span>, <\/span>'created'<\/span>))
          -><\/span>condition<\/span>(<\/span>'status'<\/span>, <\/span>1<\/span>) <\/span>\/\/Published.
          <\/span>-><\/span>condition<\/span>(<\/span>'created'<\/span>, array(<\/span>$start_time<\/span>, <\/span>$end_time<\/span>), <\/span>'BETWEEN'<\/span>)\r\n
          -><\/span>orderBy<\/span>(<\/span>'created'<\/span>, <\/span>'DESC'<\/span>) <\/span>\/\/Most recent first.
          <\/span>-><\/span>execute<\/span>();\r\n
        return <\/span>$query<\/span>;  
    }<\/span><\/pre>\n
    Step 5) Generating block content<\/h2>\n
    <\/span> Using hook_block_view<\/code> we’ll take the data generated by custom function (recent_posts_contents()<\/code>) and turn into the block content. recent_posts_block_view()<\/code> would be the following.<\/p>\n
    \/**
     * Implements hook_block_view().
     * 
     * Prepares the contents of the block.
     *\/
    <\/span>function <\/span>latest_posts_block_view<\/span>(<\/span>$delta <\/span>= <\/span>''<\/span>) {
        switch (<\/span>$delta<\/span>) {
            case <\/span>'latest_posts'<\/span>:
                <\/span>$block<\/span>[<\/span>'subject'<\/span>] = <\/span>t<\/span>(<\/span>'Latest posts'<\/span>);
                if (<\/span>user_access<\/span>(<\/span>'access content'<\/span>)) {
                    <\/span>\/\/ Use our custom function to retrieve data.
                    <\/span>$result <\/span>= <\/span>recent_posts_contents<\/span>();
                    <\/span>\/\/ Array to contain items for the block to render.
                    <\/span>$items <\/span>= array();
                    <\/span>\/\/ Iterate over the resultset and format as links.
                    <\/span>foreach (<\/span>$result <\/span>as <\/span>$node<\/span>) {
                      <\/span>$items<\/span>[] = array(
                        <\/span>'data' <\/span>=> <\/span>l<\/span>(<\/span>$node<\/span>-><\/span>title<\/span>, <\/span>'node\/' <\/span>. <\/span>$node<\/span>-><\/span>nid<\/span>),
                      ); 
                    }
                    <\/span>\/\/ No content in the last week.
                    <\/span>if (empty(<\/span>$items<\/span>)) {
                        <\/span>$block<\/span>[<\/span>'content'<\/span>] = <\/span>t<\/span>(<\/span>'No posts available.'<\/span>);  
                    } 
                    else {
                        <\/span>\/\/ Pass data through theme function.
                        <\/span>$block<\/span>[<\/span>'content'<\/span>] = <\/span>theme<\/span>(<\/span>'item_list'<\/span>, array(
                          <\/span>'items' <\/span>=> <\/span>$items<\/span>));
                    }
              }
            return <\/span>$block<\/span>;
        }
    }<\/span><\/pre>\n
    TEST<\/b><\/p>\n
    <\/span> Go to the Modules<\/b> listing page =><\/b> Check the checkbox to enable your module =><\/b> Click on Save configuration<\/b>.<\/p>\n
    <\/span> Navigate to the Structure » Blocks<\/b> and scroll down to the bottom of the list. From Disabled<\/b> section set your “Latest posts” block location to the page region and click on Save blocks<\/b>.<\/p>\n
    <\/span> If you choose the “Sidebar first” region for “Latest posts” block, you’ll see the latest posts list at the left sidebar.<\/p>\n
    \"drupal-custom-module-block-view-by-codexworld\"<\/div>\n
    <\/span> Congratulation! You have successfully created the basic Drupal custom module.<\/p>\n
    Advanced feature:<\/h2>\n
    Now we’ll implement some advanced feature and make the custom module more flexible. We’ll create a configuration form where admin would be able to adjust the number of links to display.<\/p>\n
    Step 6) Preparing for a module configuration form<\/h2>\n
    <\/span> Using hook_menu()<\/code>, we’ll define our form. Define latest_posts_menu()<\/code> function in latest_posts.module<\/code> file and add the following code.<\/p>\n
    \/**
     * Implements hook_menu().
     *\/
    <\/span>function <\/span>latest_posts_menu<\/span>() {
        <\/span>$items <\/span>= array();
      
        <\/span>$items<\/span>[<\/span>'admin\/config\/content\/latest_posts'<\/span>] = array(
          <\/span>'title' <\/span>=> <\/span>'Latest posts'<\/span>,
          <\/span>'description' <\/span>=> <\/span>'Configuration for Latest posts module'<\/span>,
          <\/span>'page callback' <\/span>=> <\/span>'drupal_get_form'<\/span>,
          <\/span>'page arguments' <\/span>=> array(<\/span>'latest_posts_form'<\/span>),
          <\/span>'access arguments' <\/span>=> array(<\/span>'access administration pages'<\/span>),
          <\/span>'type' <\/span>=> <\/span>MENU_NORMAL_ITEM<\/span>,
        );
      
        return <\/span>$items<\/span>;
    }<\/span><\/pre>\n
    title<\/b>: Required. The title of the menu item.
    \ndescription<\/b>: The description of the menu item.
    \npage callback<\/b>: The function to call to display a web page when the user visits the path.
    \npage arguments<\/b>: An array of arguments to pass to the page callback function.
    \naccess arguments<\/b>: An array of arguments to pass to the access callback function.
    \ntype<\/b>: Types constant are MENU_NORMAL_ITEM, MENU_CALLBACK, MENU_SUGGESTED_ITEM, MENU_LOCAL_ACTION, MENU_LOCAL_TASK, MENU_DEFAULT_LOCAL_TASK.<\/p>\n
    <\/span> Add the configuration button in Modules list by adding the following line in latest_posts.info<\/code> file.<\/p>\n
    \r\n; NEW LINE\t\r\nconfigure = admin\/config\/content\/latest_posts\r\n<\/pre>\n
    Step 7) Declaring the form<\/h2>\n
    <\/span> As per the “page callback”, drupal_get_form<\/code> is called when the link is requested and “page arguments” values are passed to that function. By assigning latest_posts_form<\/code>, we define that as both the form ID and the name of the function that will create our configuration form.
    \nCreate a function called latest_posts_form()<\/code> and build a form by adding elements to $form<\/code> array. Add the following code to latest_posts.module<\/code> file.<\/p>\n
    \/**
     * Page callback: Latest posts settings
     *
     * @see latest_posts_form()
     *\/
    <\/span>function <\/span>latest_posts_form<\/span>(<\/span>$form<\/span>, &<\/span>$form_state<\/span>) {
        <\/span>$form<\/span>[<\/span>'latest_posts_limit'<\/span>] = array(
          <\/span>'#type' <\/span>=> <\/span>'textfield'<\/span>,
          <\/span>'#title' <\/span>=> <\/span>t<\/span>(<\/span>'Maximum number of posts'<\/span>),
          <\/span>'#default_value' <\/span>=> <\/span>variable_get<\/span>(<\/span>'latest_posts_limit'<\/span>, <\/span>3<\/span>),
          <\/span>'#size' <\/span>=> <\/span>2<\/span>,
          <\/span>'#maxlength' <\/span>=> <\/span>2<\/span>,
          <\/span>'#description' <\/span>=> <\/span>t<\/span>(<\/span>'The maximum number of links to display in the block.'<\/span>),
          <\/span>'#required' <\/span>=> <\/span>TRUE<\/span>,
        );
      
        return <\/span>system_settings_form<\/span>(<\/span>$form<\/span>);
    }<\/span><\/pre>\n
    Step 8) Modifying the query<\/h2>\n
    <\/span> You should need to modify the recent_posts_contents()<\/code> function. Retrieved the data from the module settings form using variable_get()<\/code> and add the limit to the database query. Modified recent_posts_contents()<\/code> function would be look like the below.<\/p>\n
    \/**
     * Custom content function. 
     * 
     * Set beginning and end dates, retrieve the recent posts from the database
     *\/
    <\/span>function <\/span>recent_posts_contents<\/span>(){
        <\/span>\/\/Get today's date.
        <\/span>$today <\/span>= <\/span>getdate<\/span>();
        <\/span>\/\/Calculate the date a week ago.
        <\/span>$start_time <\/span>= <\/span>mktime<\/span>(<\/span>0<\/span>, <\/span>0<\/span>, <\/span>0<\/span>,<\/span>$today<\/span>[<\/span>'mon'<\/span>],(<\/span>$today<\/span>[<\/span>'mday'<\/span>] - <\/span>7<\/span>), <\/span>$today<\/span>[<\/span>'year'<\/span>]);
        <\/span>\/\/Get all posts from one week ago to the present.
        <\/span>$end_time <\/span>= <\/span>time<\/span>();
        
        <\/span>\/\/NEW LINE 
        <\/span>$limit <\/span>= <\/span>variable_get<\/span>(<\/span>'latest_posts_limit'<\/span>, <\/span>3<\/span>);
        
        <\/span>\/\/Use Database API to retrieve recent posts.
        <\/span>$query <\/span>= <\/span>db_select<\/span>(<\/span>'node'<\/span>, <\/span>'n'<\/span>)
          -><\/span>fields<\/span>(<\/span>'n'<\/span>, array(<\/span>'nid'<\/span>, <\/span>'title'<\/span>, <\/span>'created'<\/span>))
          -><\/span>condition<\/span>(<\/span>'status'<\/span>, <\/span>1<\/span>) <\/span>\/\/Published.
          <\/span>-><\/span>condition<\/span>(<\/span>'created'<\/span>, array(<\/span>$start_time<\/span>, <\/span>$end_time<\/span>), <\/span>'BETWEEN'<\/span>)
          -><\/span>orderBy<\/span>(<\/span>'created'<\/span>, <\/span>'DESC'<\/span>) <\/span>\/\/Most recent first.
          <\/span>-><\/span>range<\/span>(<\/span>0<\/span>, <\/span>$limit<\/span>) <\/span>\/\/NEW LINE
          <\/span>-><\/span>execute<\/span>();
        return <\/span>$query<\/span>;  
    }<\/span><\/pre>\n
    TEST<\/b><\/p>\n
    <\/span> Go to Configuration » Performance<\/b>, and click the Clear all caches<\/b> button.<\/p>\n
    <\/span> Go to the Modules<\/b> listing page =><\/b> Check the checkbox to enable your module =><\/b> Click on Save configuration<\/b>. You’ll see the Configure<\/b> link along with the module.<\/p>\n
    \"drupal-custom-module-configure-link-by-codexworld\"<\/div>\n
    <\/span> Click on the Configure<\/b> link, you would be redirected to the module settings page. You can set the maximum number of the posts to be displayed in the block.<\/p>\n
    \"drupal-custom-module-settings-form-by-codexworld\"<\/div>\n
    Based on this tutorial we have created a Drupal custom module named latest_posts<\/b>. You can download this module from the below Download Source Code<\/i> link.<\/p>\n
    <\/span> Well done! You have been developed your own module in Drupal 7. We have completed the Drupal module creation tutorial and if you have any query about Drupal custom module development, don’t hesitate to comment here.<\/p>\n","protected":false},"excerpt":{"rendered":"
    The module helps to extend and customize Drupal functionality. Drupal have three kinds of modules, core, contributed and custom. In this tutorial, you can learn how to create your own module in Drupal 7. 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Step by step guides on Drupal module creation.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.codexworld.com\/drupal-custom-module-development-tutorial\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Drupal custom module development tutorial - CodexWorld\" \/>\n<meta property=\"og:description\" content=\"Drupal module development tutorial for beginners - Learn how to create a custom module in Drupal 7. 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