メディア選択時に自分の投稿写真だけ表示する ref: http://qiita.com/halhide/items/35cb62ba3107ac19f4db

file0.php

add_action( "pre_get_posts", "set_ajax_media_query" );

function set_ajax_media_query( $wp_query ) {
    global $current_user;

    if( $wp_query ->query_vars['post_type'] != "attachment" ) {
        return;
    }

    get_currentuserinfo();

    if( $current_user->roles[0] == "administrator" ) {
        return;
    }

    $wp_query->query_vars['author'] = $current_user->ID;
}