<?php
if( !function_exists("namespace_wp_get_attachment") ) :
function namespace_wp_get_attachment( $attachment_id, $size=null ) {
    if( $size=='raw' || $size==null ) {
        $attachment = get_post( $attachment_id );
        return array(
            'alt' => get_post_meta( $attachment->ID, '_wp_attachment_image_alt', true ),
            'caption' => $attachment->post_excerpt,
            'description' => $attachment->post_content,
            'href' => get_permalink( $attachment->ID ),
            'title' => $attachment->post_title,
            'guid' => $attachment->guid,
            'name' => $attachment->post_name,
            "post_type" => $attachment->post_type
        );
    } else {
        $image = wp_get_attachment_image_src( $attachment_id, $size );
        return $image;
    }
}
endif;