1. 后台内容要能添加, 通过add_meta_box实现
在functions.php中添加如下代码
function post_meta_boxes_setup() {
/* Add meta boxes on the 'add_meta_boxes' hook. */
add_action( 'add_meta_boxes', 'add_post_meta_boxes' );
/* Save post meta on the 'save_post' hook. */
add_action( 'save_post', 'save_post_source_meta', 10, 2 );
}
function add_post_meta_boxes() {
add_meta_box(
'post-source', // Unique ID
esc_html__( '文章来源/作者', 'low-text' ), // Title
'post_source_meta_box', // Callback function
'post', // Admin page (or post type)
'normal', // Context
'high' // Priority
);
}
function post_source_meta_box( $object, $box ) { ?>
<?php wp_nonce_field( basename( __FILE__ ), 'post_source_nonce' ); ?>
<p>
<label>文章来源</label><br/>
<input class="widefat" type="text" name="post-source" id="post-source" value="<?php echo esc_html__( get_post_meta( $object->ID, 'post_source', true ) ); ?>" size="30" />
<label>文章作者</label><br/>
<input class="widefat" type="text" name="post-author" id="post-autohr" value="<?php echo esc_html__( get_post_meta( $object->ID, 'post_author', true ) ); ?>" size="30" />
</p>
<?php }
function save_post_source_meta( $post_id, $post ) {
/* Verify the nonce before proceeding. */
if ( !isset( $_POST['post_source_nonce'] ) || !wp_verify_nonce( $_POST['post_source_nonce'], basename( __FILE__ ) ) )
return $post_id;
/* Get the post type object. */
$post_type = get_post_type_object( $post->post_type );
/* Check if the current user has permission to edit the post. */
if ( !current_user_can( $post_type->cap->edit_post, $post_id ) )
return $post_id;
/* Get the posted data and sanitize it for use as an HTML class. */
$new_meta_value = ( isset( $_POST['post-source'] ) ? balanceTags( $_POST['post-source'] ) : '' );
/* Get the meta key. */
$meta_key = 'post_source';
/* Get the meta value of the custom field key. */
$meta_value = get_post_meta( $post_id, $meta_key, true );
/* If a new meta value was added and there was no previous value, add it. */
if ( $new_meta_value && '' == $meta_value )
add_post_meta( $post_id, $meta_key, $new_meta_value, true );
/* If the new meta value does not match the old value, update it. */
elseif ( $new_meta_value && $new_meta_value != $meta_value )
update_post_meta( $post_id, $meta_key, $new_meta_value );
/* If there is no new meta value but an old value exists, delete it. */
elseif ( '' == $new_meta_value && $meta_value )
delete_post_meta( $post_id, $meta_key, $meta_value );
/* Get the posted data and sanitize it for use as an HTML class. */
$new_meta_value = ( isset( $_POST['post-author'] ) ? balanceTags( $_POST['post-author'] ) : '' );
/* Get the meta key. */
$meta_key = 'post_author';
/* Get the meta value of the custom field key. */
$meta_value = get_post_meta( $post_id, $meta_key, true );
/* If a new meta value was added and there was no previous value, add it. */
if ( $new_meta_value && '' == $meta_value )
add_post_meta( $post_id, $meta_key, $new_meta_value, true );
/* If the new meta value does not match the old value, update it. */
elseif ( $new_meta_value && $new_meta_value != $meta_value )
update_post_meta( $post_id, $meta_key, $new_meta_value );
/* If there is no new meta value but an old value exists, delete it. */
elseif ( '' == $new_meta_value && $meta_value )
delete_post_meta( $post_id, $meta_key, $meta_value );
}
在wp-admin/post.php, wp-admin/post-new.php中靠前的地方, 调用勾子函数
post_meta_boxes_setup();
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