Return a Custom Image Array Attached to Given Post

custom_attached_image_array.php

/**
 * Generate a custom array of image attachment information
 *
 * @param Integer $post_id
 *
 * @return Array(
 *			'ID'			=> 123,
 *			'title'			=> 'Image Title Attribute',
 *			'alt'			=> 'Image Alt Attribute',
 *			'caption'		=> 'Image Caption Attribute',
 *			'description'	=> 'Image Description Attribute',
 *			'page_url'		=> 'http://wp.example.net/path_to_post/post_name/attachment_name'
 *			'sizes'			=> Array(
 *								'thumbnail' => Array(
 *												'url'			=> 'http://wp.example.net/wp-content/uploads/current_year/publish_month/filename-150x150.jpg',
 *												'width'			=> 150,
 *												'height'		=> 150,
 *												'intermediate'	=> 1,
 *								)
 *			)
 *		)
 */
function wpse_get_custom_image_data( $post_id = false ) {
	
	if( empty( $post_id ) ) {
		return array();
	}
	
	$attachments 	= array();
	$image_arr 		= get_posts( array(
		'post_type' 		=> 'attachment',
		'posts_per_page' 	=> 500,
		'post_status' 		=> 'any',
		'post_parent' 		=> $post_id,
		'post_mime_type'	=> array( 'image/jpeg', 'image/gif', 'image/png' ),
	) );

	if( ! empty( $image_arr ) ) {
		
		foreach( $image_arr as $postobj ) {
			
			$image_sizes 	= array( 'thumbnail', 'medium', 'large', 'full' );
			$alt_attr		= get_post_meta( $postobj->ID, '_wp_attachment_image_alt', true );
			$image_data		= array(
				'ID'			=> $postobj->ID,								// Image ID
				'title'			=> $postobj->post_title,						// Image Title
				'alt'			=> $alt_attr,								// Image Alt Attribute
				'caption'		=> wp_get_attachment_caption( $postobj->ID ),	// Image Caption
				'description'	=> $postobj->post_content,						// Image Description
				'page_url'		=> get_permalink( $postobj->ID ),				// Attachment Page Permalink
			);
			
			foreach( $image_sizes as $size ) {
				$src_arr = wp_get_attachment_image_src( $postobj->ID, $size, false );
				
				if( ! empty( $src_arr ) ) {
				
					// Reassign keys
					$new_src_arr = array_combine( array( 'url', 'width', 'height', 'intermediate' ), array_values( $src_arr ) );
				
					$image_data['sizes'][ $size ] = $new_src_arr;
				}
			}
			
			$attachments[] = $image_data;
		}
		
	}

	return $attachments;
	
}