$content = preg_replace($tags, $tag_html, $content);

$content = preg_replace($tags, $tag_html, $content, 1);

function auto_link_tags($content){ 

    //$post_id = get_the_ID(); 
    $post_tags = get_the_tags(); 
	$varmi="";
    if ($post_tags) { 
        $i = 0; 
        foreach($post_tags as $tag) { 
		if(strstr($varmi,"($tag)")
		{
		}
		else
		{
            $tags[$i] = "~<(?:a\\s.*?</a>|[^>]+>)(*SKIP)(*FAIL)|\\b(?:\\b(" . $tag->name . ")\\b(?=[^>]*(<|$)))\\b~i"; 
            $tag_url = get_tag_link($tag->term_id); 
            $tag_html[$i] = '<a style="color:#FF0000;" href="' . $tag_url . '" rel="tag" title="$1">$1</a>'; 
            $i++; 
			$varmi.="($tag)";
        }
		
        $content = preg_replace($tags, $tag_html, $content); 
    } 

    return $content; 

}