image title on caption

remove_shortcode('wp_caption');
remove_shortcode('caption');
add_shortcode('wp_caption', 'custom_img_caption_shortcode');
add_shortcode('caption', 'custom_img_caption_shortcode');

function custom_img_caption_shortcode($attr, $content = null) {
//output image title above caption field//
    // New-style shortcode with the caption inside the shortcode with the link and image tags. wp3.4
    if ( ! isset( $attr['caption'] ) ) {
        if ( preg_match( '#((?:<a [^>]+>\s*)?<img [^>]+>(?:\s*</a>)?)(.*)#is', $content, $matches ) ) {
            $content = $matches[1];
            $attr['caption'] = trim( $matches[2] );
        }
    }

    extract(shortcode_atts(array(
        'id'    => '',
        'align' => 'alignnone',
        'width' => '',
        'caption' => ''
    ), $attr));

    if ( 1 > (int) $width || empty($caption) )
        return $content;

    if ( $id ) { $img_id = array_pop(explode('_',$id)); $id = 'id="' . esc_attr($id) . '" '; }

    $framewidth = 5; // frame width in px per side; default is 5 //

    $output =  '<div ' . $id . 'class="wp-caption ' . esc_attr($align) . '" style="width: ' . ( 2 * $framewidth + (int) $width) . 'px">';
    $output .= do_shortcode( $content );

    $title = ''; //extract the image title with preg_match_all from $content
    if ( preg_match_all( '#(title=")(.*)(" )#U', $content, $matches, PREG_PATTERN_ORDER ) ) {
        $title = str_replace(array('title="','"'),'',$matches[0][0]);
        }
    if( $title ) $output .= '<span class="caption-image-title">' . $title . '</span>';

    $output .= '<p class="wp-caption-text">' . $caption . '</p></div>';
    return $output;
}