Amit Gupta

iG:Custom Metaboxes is a WordPress plugin to provide an object oriented and clean API for creating custom meta-boxes on wp-admin post_type add/edit screens.
This plugin is more or less a library which is meant to be used in other plugins or themes. On its own this plugin does nothing, it has no UI nor any configuration to be set/tweaked. This plugin allows addition of HTML5 fields however the functionality of specialized fields like color picker, date picker etc. is browser dependent. The plugin does not add any JavaScript to make these fields compatible with browsers which don’t support HTML5 or which don’t add functionality to these specialized fields.
This plugin has been written with WordPress.com VIP compliance in mind, so you can use it as is even if you host your website with WordPress.com VIP.
Requirements: This plugin requires PHP 5.4 or better and is supported on WordPress 4.0 or better. It might work on a lower version of PHP or WordPress but no support would be provided for those platforms.
Pull requests on Github are welcome.
Github: https://github.com/coolamit/ig-custom-metaboxes
<h3>Plugin Usage</h3>
On its own this plugin will not do anything, it is a library meant to be used in other plugins/themes. It provides an API to create custom metaboxes in wp-admin on post_type screens in an object oriented way.
Usage Example:
<pre><code>$metabox = new iG\Metabox\Metabox( 'my-metabox-1' );

$metabox->set_title( 'My Cool Metabox' )
 ->set_context( 'normal' )
 ->set_priority( 'default' )
 ->set_css_class( 'my-metabox' )
 ->set_post_type( 'post' )
 ->add_field( //add a simple text input field
 iG\Metabox\Text_Field::create( 'my-txt-1', 'My Text Field 1' )
 ->set_description( 'Some Desc for 1st Field' )
 ->set_css_class( 'my-txt-css-1 second-css-cls' )
 ->set_placeholder( 'Enter the first text here' )
 ->set_size( 50 )
 )
 ->add_field( //add a HTML5 number input field
 iG\Metabox\Number_Field::create( 'my-num-1', 'My Numb Field A' )
 ->set_description( 'Some Desc for 1st Number Field' )
 ->set_css_class( 'my-num-css-1' )
 ->set_placeholder( 'Enter the first number here' )
 ->set_step( 2.5 )
 )
 ->add_field( //add a HTML5 color picker
 iG\Metabox\Color_Field::create( 'my-col-1', 'My Color Field 1a' )
 ->set_description( 'Some Desc for 1st Color Field' )
 ->set_css_class( 'my-colr-css-1' )
 )
 ->add_field( //add a HTML date picker
 iG\Metabox\Date_Field::create( 'my-dt-1', 'My Date Field 1a' )
 ->set_description( 'Some Desc for 1st Date Field' )
 ->set_css_class( 'my-dt-css-1' )
 ->set_min( '2014-05-01' )
 )
 ->add_field( //add a HTML5 date time picker
 iG\Metabox\Date_Time_Field::create( 'my-dttm-1', 'My Date Time Field A' )
 ->set_description( 'Some Desc for 1st Date Time Field' )
 ->set_css_class( 'my-dttm-css-1' )
 ->set_min( '2014-05-01T05:00' )
 )
 ->add_field( //add a radio button group
 iG\Metabox\Radio_Group::create( 'my-rdg-1', 'My Radio Group A' )
 ->set_description( 'Some Desc for 1st Radio Group' )
 ->set_css_class( 'my-rdg-css-1' )
 ->set_values( array(
 'apple' => 'Apple',
 'grape' => 'Grape',
 'banana' => 'Banana',
 'orange' => 'Orange',
 'peach' => 'Peach',
 ) )
 )
 ->add();
</code></pre>

iG:Custom Metaboxes

A WordPress plugin to provide an object oriented and clean API for creating custom meta-boxes on wp-admin post_type add/edit screens.

Tahir Yasin

This plugin adds a meta box to upload multiple images for posts and pages. You can enable it for custom post types also, please see installation instructions.
<h3>miu_get_images()</h3>
This function can be called from any template file to get attached images for the page/post being viewed. 
It returns an array of the attached image URL.
It take only one argument:
<ol>
<li>
post_id (integer) to get images linked to a specific post
 http://www.example.com/image-1.png 
 [1] => http://www.example.com/image-2.png 
)
?></li>
</ol>

Multi Image Upload

This plugin adds a meta box to upload multiple images for posts and pages.

iG:Custom Metaboxes vs Multi Image Upload