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An example WP plugin which adds functionalities to the WordPress Media Library
<?php
/**
* @package Media_hacks
* @version 1.0
*/
/*
Plugin Name: Media hacks
Plugin URI: http://wordpress.org/extend/plugins/#
Description: This is an example plugin
Author: Carlo Daniele
Version: 1.0
Author URI: http://carlodaniele.it/en/
*/
/**
* Filters the attachment fields to edit.
*
* @param array $form_fields An array of attachment form fields.
* @param WP_Post $post The WP_Post attachment object.
*/
function media_hacks_attachment_fields_to_edit( $form_fields, $post ){
// https://codex.wordpress.org/Function_Reference/wp_get_attachment_metadata
$media_author = get_post_meta( $post->ID, 'media_author', true );
$form_fields['media_author'] = array(
'value' => $media_author ? $media_author : '',
'label' => __( 'Author' )
);
// get post mime type
$type = get_post_mime_type( $post->ID );
// get the attachment path
$attachment_path = get_attached_file( $post->ID );
// get image metadata
$metadata = wp_read_image_metadata( $attachment_path );
if( 'image/jpeg' == $type ){
if( $metadata ) {
$exif_data = array(
'aperture' => 'Aperture',
'camera' => 'Camera',
'created_timestamp' => 'Timestamp',
'focal_length' => 'Focal Lenght',
'iso' => 'ISO',
'shutter_speed' => 'Exposure Time',
'orientation' => 'Orientation' );
foreach ( $exif_data as $key => $value ) {
$exif = $metadata[$key];
$form_fields[$key] = array(
'value' => $exif ? $exif : '',
'label' => __( $value ),
'input' => 'html',
'html' => "<input type='text' class='text' readonly='readonly' name='attachments[$post->ID][$exif]' value='" . $exif . "' /><br />"
);
}
}
}
return $form_fields;
}
add_filter( 'attachment_fields_to_edit', 'media_hacks_attachment_fields_to_edit', 10, 2 );
/**
* Update attachment metadata
*
* @param int $post_ID Attachment ID.
*/
function media_hacks_edit_attachment( $attachment_id ){
if ( isset( $_REQUEST['attachments'][$attachment_id]['media_author'] ) ) {
$media_author = $_REQUEST['attachments'][$attachment_id]['media_author'];
update_post_meta( $attachment_id, 'media_author', $media_author );
}
}
add_action( 'edit_attachment', 'media_hacks_edit_attachment' );
/**
* Filters the post content.
*
* @param string $content Content of the current post.
*/
function media_hacks_the_content( $content ){
global $post;
if( is_attachment() && 'image/jpeg' == get_post_mime_type( $post->ID ) ) {
$fields = wp_get_attachment_metadata( $post->ID );
$meta = $fields['image_meta'];
if( ! empty( $meta['camera'] ) ){
$custom_content = "
<ul>
<li>Camera: {$meta['camera']}</li>
<li>Created timestamp: {$meta['created_timestamp']}</li>
<li>Aperture: {$meta['aperture']}</li>
<li>Focal length: {$meta['focal_length']}</li>
<li>ISO: {$meta['iso']}</li>
<li>Shutter speed: {$meta['shutter_speed']}</li>
<li>Orientation: {$meta['orientation']}</li>
</ul>";
$content .= $custom_content;
}
}
return $content;
}
add_filter( 'the_content', 'media_hacks_the_content' );
/**
* Registers post type arguments.
*
* @param array $args Array of arguments for a post type
* @param string $post_type Post type key
*/
function media_hacks_register_post_type_args( $args, $post_type ){
if( $post_type == 'attachment' ){
$args['has_archive'] = true;
}
return $args;
}
add_filter( 'register_post_type_args', 'media_hacks_register_post_type_args', 10, 2 );
/**
* Set custom query vars for WP_Query
*
* @param WP_Query &$this The WP_Query instance (passed by reference).
*/
function media_hacks_pre_get_posts( $query ){
if ( !is_admin() && $query->is_main_query() ) {
if( is_post_type_archive('attachment') ){
$query->set('post_mime_type', 'image/jpeg');
$query->set( 'post_status', 'inherit' );
}
}
}
add_action( 'pre_get_posts', 'media_hacks_pre_get_posts' );
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