<?php function thb_header( $atts, $content = null ) {
extract(shortcode_atts(array(
		'style'			=> '',
   	'title'      => '',
   	'sub_title' => '',
   	'icon'			 => '',
   	'is_image'	 => false,
   	'image'			 => '',
   	'color'			=> 'dark'
), $atts));


if($is_image && $image) {  
$img_id = preg_replace('/[^\d]/', '', $image);
$img = wp_get_attachment_image_src($img_id, 'full');

$out = '<img src="'.$img[0].'" alt="'.$title.'" />'; 
} else {
$icon = ($icon ? $icon : 'fa-rocket');
$out = '<i class="fa '.$icon.'"></i>'; 
}

$out = '<aside class="styled_header '.$style.' '.$color.'"><h6>'.$title.'</h6><span class="icon">'.$out.'</span>'. ($sub_title ? '<p>'.$sub_title.'</p>' : '').'</aside>';

return $out;
}
add_shortcode('thb_header', 'thb_header');