WordPress 给分类与标签添加自定义字段

add_action('category_add_form_fields','erphp_ct_add_category_field',20,2); 

function erphp_ct_add_category_field(){ 

echo '<div class="form-field">

<label for="erphp_cat_title">标题去站名</label>

<select name="erphp_cat_title" id="erphp_cat_title" class="postform">

<option value="0">关闭</option>

<option value="1">开启</option>

</select>

<p class="description">分类下的文章标题里不带网站名</p>

</div>';

}

add_action('category_edit_form_fields','erphp_ct_edit_category_field',20,2); 

function erphp_ct_edit_category_field($tag){ 

$erphp_cat_title = get_term_meta($tag->term_id,'erphp_cat_title',true);

echo '<tr class="form-field">

<th scope="row">

<label for="erphp_cat_title">标题去站名</label>

<td>

<select name="erphp_cat_title" id="erphp_cat_title" class="postform">

<option value="0" '. ('0'==$erphp_cat_title?'selected="selected"':'') .'>关闭</option>

<option value="1" '. ('1'==$erphp_cat_title?'selected="selected"':'') .'>开启</option>

</select>

<p class="description">分类下的文章标题里不带网站名</p>

</td>

</th>

</tr>';

}

add_action('created_category','erphp_ct_category_field_edited',20,1); 

add_action('edited_category','erphp_ct_category_field_edited',20,1); 

function erphp_ct_category_field_edited($term_id){

update_term_meta($term_id,'erphp_cat_title',$_POST['erphp_cat_title']);

}

function erphp_ct_wp_title( $title, $sep ) {

if(is_single()){

$erphp_ct = 0;

$categories = get_the_category();

if($categories) {

foreach($categories as $cat){

$erphp_cat_title = get_term_meta($cat->term_id,'erphp_cat_title',true);

if($erphp_cat_title){

$erphp_ct = 1;

break;

}

}

}

if($erphp_ct){

$title = get_the_title();

}

}

return $title;

}

add_filter( 'wp_title', 'erphp_ct_wp_title', 100, 2 );