Wordpress functions to run image replace for timthumb

gistfile1.txt

/*-----------------------------------------------------------------------------------*/
/* Replace image src values
/*-----------------------------------------------------------------------------------*/

if (!function_exists('ic_replace_image_src')) {
	function ic_replace_image_src($img = null) {	
		$live = 'mysite.com.au ';
		if ($_SERVER['HTTP_HOST'] == $live) {
			return;
		} else {			
			$replace = ic_set_image_src();
			if (preg_match('/mysite.co.nz/', $img)) {
				$pattern = '/mysite.co.nz/';
				$result = preg_replace($pattern, $replace, $img);
			} else {
				$pattern = '/mysite.com.au/';
				$result = preg_replace($pattern, $replace, $img);
			}
			return $result;
		}
		
	}
}

/*-----------------------------------------------------------------------------------*/
/* Return replacement image src values
/*-----------------------------------------------------------------------------------*/

if (!function_exists('ic_set_image_src')) {
	function ic_set_image_src() {
		$host = $_SERVER['HTTP_HOST'];
		switch ($host) {
			case 'localhost':
			case 'mysite.com.au':
				$str = $_SERVER['HTTP_HOST'].'/mysite';
				break;
			default:
				$str = $_SERVER['HTTP_HOST'];
		}
		return $str;
	}
}

/*-----------------------------------------------------------------------------------*/
/* Replace images with the correct sizes in single posts
/*-----------------------------------------------------------------------------------*/

if (!function_exists('ic_resize_images')) {
	function ic_resize_images($content = null, $after = null) {
		$result = null;
		
		preg_match_all('|<img .*?src=[\'"](.*?)[\'"].*?/>|i', $content, $assets);
		if (sizeof($assets[0]) > 0) {
			foreach ($assets[1] as $key=>$item) {
				$assets[1][$key] = ic_replace_image_src($item);
			}
			
			if (count($assets[0]) >= 1) {
				$images = array();
				foreach ($assets[0] as $key => $img) {
					$images[$key] = 'img src="'.PARENT_URL.'/vendors/timthumb.php?src='.$assets[1][$key].'&w=540&zc=1" alt="'.get_the_title().'" /';
				}
				$result = preg_replace($assets[0], $images, $content);
			}
			
			if (isset($after)) {
				$result = str_replace ('/></a>', '/></a>'.$after, $result);
			}
			
			$result = apply_filters('the_content', $result);
			$result = str_replace(']]>', ']]&gt;', $result);
		} else {
			$result = $content;
		}
		return $result;
	}
}