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Home Carbon Ads File Upload using WordPress Settings API

File Upload using WordPress Settings API

The register_setting function saves the value attribute on form submission directly into the database. We can also alter or validate the value based on our choice. The register_setting function takes a third argument which is a callback, this callback is fired before it saves the settings into the database.

For uploading files through settings pages we can handle the uploads via the callback and then store the URL to the file in dbms. Here is example code showing how to do that;

<?php

function demo_settings_page()
{
    add_settings_section("section", "Section", null, "demo");
    add_settings_field("demo-file", "Demo File", "demo_file_display", "demo", "section");  
    register_setting("section", "demo-file", "handle_file_upload");
}

function handle_file_upload($option)
{
  if(!empty($_FILES["demo-file"]["tmp_name"]))
  {
    $urls = wp_handle_upload($_FILES["demo-file"], array('test_form' => FALSE));
    $temp = $urls["url"];
    return $temp;  
  }
 
  return $option;
}

function demo_file_display()
{
   ?>
        <input type="file" name="demo-file" />
        <?php echo get_option('demo-file'); ?>
   <?php
}

add_action("admin_init", "demo_settings_page");

function demo_page()
{
  ?>
      <div class="wrap">
         <h1>Demo</h1>
 
         <form method="post" action="options.php">
            <?php
               settings_fields("section");
 
               do_settings_sections("demo");
                 
               submit_button();
            ?>
         </form>
      </div>
   <?php
}

function menu_item()
{
  add_submenu_page("options-general.php", "Demo", "Demo", "manage_options", "demo", "demo_page");
}
 
add_action("admin_menu", "menu_item");

Here is a screenshot of the settings page

rsz_screen_shot_2015-03-31_at_80125_pm

Mar 31, 2015Narayan Prusty
WordPress Settings API Validation and SanitizationHTTP/2 for WordPress Sites
Comments: 3
  1. zsolt
    5 years ago

    Second useful tutorial from you. Thanks a lot.

    ReplyCancel
  2. Xzaara
    7 years ago

    I think that the form tag should have additional attribute: enctype=”multipart/form-data”.

    ReplyCancel
  3. Nick Pocock
    7 years ago

    Could you explain how/why you pass the parameter $option and where it comes from / what happens when you return it?

    ReplyCancel

Leave a Reply to Nick Pocock Cancel reply

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Narayan Prusty

I am a software engineer specialising in Blockchain, DevOps and Go/JavaScript. This is my personal blog where I write about things that I learn and feel interesting to share.

7 years ago 3 Comments WordPress
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