<?php



add_action('after_setup_theme','seo_title_action',100);

function seo_title_action()

{

    remove_all_filters( 'wp_title', 9999 );

    add_filter('wp_title','seo_title_filter',10000);

	if(current_theme_supports('title-tag')) {

		remove_theme_support('title-tag');

		add_action( 'wp_head', 'seo_render_title', 0 );

	}

}

function seo_render_title() {

	?>

	<title><?php wp_title(''); ?></title>

	<?php

}

function seo_title_filter($title){

    global $page,$paged;

    $title = trim($title);



    $seo_split = seo_get('split');



    $seo_site_title = seo_get('site_title');



    $seo_cat_title = seo_get('cat_title');

    $seo_tag_title = seo_get('tag_title');

    $seo_post_title = seo_get('post_title');

    $seo_page_title = seo_get('page_title');



    $blog_name = get_bloginfo('name');

    $blog_description = get_bloginfo('description');



    // 首页标题优化

    if((is_home() || is_front_page())){

	    $seo_site_title = apply_filters('seo_site_title',$seo_site_title);

        if($seo_site_title) {

            $partten = array(

                '{blog_name}',

                '{blog_description}',

                '{split}'

            );

            $res = array(

                $blog_name,

                $blog_description,

                $seo_split

            );

            $title = str_replace($partten,$res,$seo_site_title);

        }

        else {

            $title = $blog_name.$seo_split.$blog_description;

        }

    }

    // 分类页标题

    elseif(is_category()){

        global $cat;

        $cat_name = single_cat_title('',false);

        $cat_parents = seo_get_category_parents($cat);

        $cat_meta = seo_get_term_meta($cat,'seo_title');



	    $seo_cat_title = apply_filters('seo_cat_title',$seo_cat_title);

        if($seo_cat_title) {

            $partten = array(

                '{blog_name}',

                '{blog_description}',

                '{split}',

                '{title}',

                '{meta_or_title}',

                '{parents_split}'

            );

            $res = array(

                $blog_name,

                $blog_description,

                $seo_split,

                $cat_name,

                $cat_meta ? $cat_meta : $cat_name,

	            $cat_parents ? $cat_parents.$seo_split : ''

            );

            $title = str_replace($partten,$res,$seo_cat_title);

        }

        else {

            $title = ($cat_meta ? $cat_meta : $cat_name).$seo_split.$blog_name;

        }

    }

    // 标签页标题

    elseif(is_tag()){

        global $wp_query;

        $tag_id = $wp_query->queried_object->term_id;

        $tag_name = $wp_query->queried_object->name;

        $tag_meta = get_term_meta($tag_id,'seo_title',true);



	    $seo_tag_title = apply_filters('seo_tag_title',$seo_tag_title);

        if($seo_tag_title) {

            $partten = array(

                '{blog_name}',

                '{blog_description}',

                '{split}',

                '{title}',

                '{meta_or_title}'

            );

            $res = array(

                $blog_name,

                $blog_description,

                $seo_split,

                $tag_name,

                $tag_meta ? $tag_meta : $tag_name

            );

            $title = str_replace($partten,$res,$seo_tag_title);

        }

        else {

            $title = ($tag_meta ? $tag_meta : $tag_meta).$seo_split.$blog_name;

        }

    }

    // 文章页的标题

    elseif(is_single()){

        global $post;

        $post_id = $post->ID;

        $post_title = trim($post->post_title);

        $post_time = $post->post_date;

        $post_meta = seo_get_post_meta($post_id,'_seo_title');



        $post_cats = strip_tags(get_the_category_list( ',', 'multiple', $post_id ));

        $post_tags = strip_tags(get_the_tag_list('',',',''));



	    $seo_post_title = apply_filters('seo_post_title',$seo_post_title);

        if($seo_post_title) {

            $partten = array(

                '{blog_name}',

                '{blog_description}',

                '{split}',

                '{title}',

                '{title_or_time}',

	            '{time}',

	            '{meta}',

                '{meta_or_title}',

                '{meta_or_title_or_time}',

                '{categories_split}',

                '{tags_split}'

            );

            $res = array(

                $blog_name,

                $blog_description,

                $seo_split,

                $post_title,

                $post_title ? $post_title : $post_time,

	            $post_time,

	            $post_meta,

                $post_meta ? $post_meta : $post_title,

                $post_meta ? $post_meta : ($post_title ? $post_title : $post_time),

	            $post_cats ? $post_cats.$seo_split : '',

                $post_tags ? $post_cats.$seo_split : ''

            );

	        $title = str_replace($partten,$res,$seo_post_title);

        }

        else {

            $title = ($post_meta ? $post_meta : ($post_title ? $post_title : $post_time)).$seo_split.$blog_name;

        }

    }

    elseif(is_singular()) {

        global $post;

        $post_id = $post->ID;

        $post_title = trim($post->post_title);

        $post_meta = seo_get_post_meta($post_id,'_seo_title');



	    $seo_page_title = apply_filters('seo_page_title',$seo_page_title);

        if($seo_page_title) {

            $partten = array(

                '{blog_name}',

                '{blog_description}',

                '{split}',

                '{title}',

                '{meta_or_title}'

            );

            $res = array(

                $blog_name,

                $blog_description,

                $seo_split,

                $post_title,

                $post_meta ? $post_meta : $post_title

            );

            $title = str_replace($partten,$res,$seo_page_title);

        }

        else {

            $title = ($post_meta ? $post_meta : $post_title).$seo_split.$blog_name;

        }

    }



    if($paged >= 2 || $page >= 2){

        $title .= $seo_split.sprintf(__('第%s页'),max($paged,$page));

    }



    $title = seo_clear_code($title);

    $title = strip_tags($title);

    $title = trim($title);

	$title = apply_filters('seo_title',$title);



    return $title;

}