一个类别中的每个帖子只允许一个元键值

我已经为我正在处理的主题创建了一个元框，它是一个简单的元框，带有一个用于特色帖子的复选框。问题是用户可以勾选该复选框multiple posts 在same category.

我想禁用旧帖子的元值，一旦在该类别下发布了新帖子。因此，基本上只允许检查任何给定类别上的1篇文章。我想我应该做点什么

delete_post_meta( $post_id, \'featured_post\' );

但我不知道如何检查以前的帖子并从中删除帖子元。有什么建议吗？

Update #1 :

这是我的元框：

//FEATURED POST CHECK BOX

//ADD THE META BOX
add_action( \'add_meta_boxes\', \'add_featured_slide\' );
function add_featured_slide(){
    //POST TYPES TO HAVE THE CUSTOM META BOX 
    $ctptypes = array( \'post\', \'page\', \'your_custom_post_type\' );
    foreach ( $ctptypes as $ctptype ) {
        add_meta_box( \'featured-slide\', \'Featured Post\', \'featured_slide_func\', $ctptype, \'side\', \'high\' );
    }
}
//DEFINE THE META BOX
function featured_slide_func( $post ){
    $values = get_post_custom( $post->ID );
    $check = isset( $values[\'special_box_check\'] ) ? esc_attr( $values[\'special_box_check\'][0] ) : \'\';
    wp_nonce_field( \'my_featured_slide_nonce\', \'featured_slide_nonce\' );
    ?>
    <p>
        <input type="checkbox" name="special_box_check" id="special_box_check" <?php checked( $check, \'on\' ); ?> />
        <label for="special_box_check">Feature this post?</label>
    </p>
    <?php 
}
//SAVE THE META BOX DATA WITH THE POST
add_action( \'save_post\', \'featured_slide_save\' );
function featured_slide_save( $post_id ){
    if( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) return;
    if( !isset( $_POST[\'featured_slide_nonce\'] ) || !wp_verify_nonce( $_POST[\'featured_slide_nonce\'], \'my_featured_slide_nonce\' ) ) return;
    if( !current_user_can( \'edit_post\' ) ) return;
    $allowed = array( 
        \'a\' => array( 
            \'href\' => array() 
        )
    );
    // IF CHECKED SAVE THE CUSTOM META
    if ( isset( $_POST[\'special_box_check\'] ) && $_POST[\'special_box_check\'] ) {
        add_post_meta( $post_id, \'special_box_check\', \'on\', true );
    }
    // IF UNCHECKED DELETE THE CUSTOM META
    else {
        delete_post_meta( $post_id, \'special_box_check\' );
    }
}

//ADD THE META BOX add_action( \'add_meta_boxes\', \'add_featured_slide\' ); function add_featured_slide(){ //POST TYPES TO HAVE THE CUSTOM META BOX $ctptypes = array( \'post\', \'page\', \'your_custom_post_type\' ); foreach ( $ctptypes as $ctptype ) { add_meta_box( \'featured-slide\', \'Featured Post\', \'featured_slide_func\', $ctptype, \'side\', \'high\' ); } } //DEFINE THE META BOX function featured_slide_func( $post ){ $values = get_post_custom( $post->ID ); $check = isset( $values[\'special_box_check\'] ) ? true : false; wp_nonce_field( \'my_featured_slide_nonce\', \'featured_slide_nonce\' ); ?> <p> <input type="checkbox" name="special_box_check" id="special_box_check" <?php checked( $check); ?> /> <label for="special_box_check">Feature this post?</label> </p> <?php } //SAVE THE META BOX DATA WITH THE POST add_action( \'save_post\', \'featured_slide_save\', 10, 2 ); function featured_slide_save( $post_id, $post ){ if( defined( \'DOING_AUTOSAVE\' ) && DOING_AUTOSAVE ) return; if( !isset( $_POST[\'featured_slide_nonce\'] ) || !wp_verify_nonce( $_POST[\'featured_slide_nonce\'], \'my_featured_slide_nonce\' ) ) return; if( !current_user_can( \'edit_post\' ) ) return; $allowed = array( \'a\' => array( \'href\' => array() ) ); // Changes follow if ( isset( $_POST[\'special_box_check\'] ) && $_POST[\'special_box_check\'] ) { $cats = wp_get_post_categories($post_id); foreach ($cats as $v) { delete_metadata ( \'post\', null, \'special_box_check\', $v, true ); } foreach ($cats as $v) { add_post_meta( $post_id, \'special_box_check\', $v); } } else { delete_post_meta( $post_id, \'special_box_check\' ); } }

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