未保存媒体库中的自定义字段，SELECTED()函数未将“SELECTED”添加到选择列表输入类型

遵循开发人员文档中的方法selected() 但无法使其与媒体库中的自定义字段一起用于选择列表。

它不会保存价值，也不会变成；已选定；。看起来WP正在后台执行一些js/ajax，所以我需要以不同的方式来处理这个问题，还是有一个愚蠢的拼写错误？

请参阅下面的代码，非常感谢您的帮助。

/*
Add license field to media attachments 
*/

    function add_custom_field_license( $form_fields, $post ) {
        $license_field = get_post_meta($post->ID, \'license_field\');
        $form_fields[\'license_field\'] = [
            \'label\' => \'License\',
            \'input\' => \'html\',
            \'html\' => "<select name=\'attachments[{$post->ID}][license_field]\' id=\'attachments-{$post->ID}-license_field\'> 
        <option value=\'none\' " . selected($license_field, "none") . ">None (all rights reserved)</option>
        <option value=\'CC0\' " . selected($license_field, "CC0") . ">CC0</option>
        <option value=\'CC BY\' " . selected($license_field, "CC BY") . ">CC BY</option>
        </select>",
        ];
        return $form_fields;
    }
    add_filter(\'attachment_fields_to_edit\', \'add_custom_field_license\', null, 2); 



/*
Save license field to media attachments
*/
function save_custom_field_license($post, $attachment) {  
    if( isset($attachment[\'license_field\']) ){  
        update_post_meta($post[\'ID\'], \'license_field\', sanitize_text_field( $attachment[\'license_field\'] ) );  
    }else{
         delete_post_meta($post[\'ID\'], \'license_field\' );
    }
    return $post;  
}
add_filter(\'attachment_fields_to_save\', \'save_custom_field_licenser\', null, 2);

/* Add license field to media attachments */ function add_custom_field_license( $form_fields, $post ) { $license_field = get_post_meta($post->ID, \'license_field\', true); $form_fields[\'license_field\'] = [ \'label\' => \'License\', \'input\' => \'html\', \'html\' => "<select name=\'attachments[{$post->ID}][license_field]\' id=\'attachments-{$post->ID}-license_field\'> <option value=\'none\' " . selected($license_field, "none", false) . ">None (all rights reserved)</option> <option value=\'CC0\' " . selected($license_field, "CC0", false) . ">CC0</option> <option value=\'CC BY\' " . selected($license_field, "CC BY", false) . ">CC BY</option> <option value=\'CC BY-NC\' " . selected($license_field, "CC BY-NC", false) . ">CC BY-NC</option> <option value=\'CC BY-SA\' " . selected($license_field, "CC BY-SA", false) . ">CC BY-SA</option> <option value=\'CC BY-NC-ND\' " . selected($license_field, "CC BY-NC-ND", false) . ">CC BY-NC-ND</option> </select>", ]; return $form_fields; } add_filter(\'attachment_fields_to_edit\', \'add_custom_field_license\', null, 2); /* Save license field to media attachments */ function save_custom_field_license($post, $attachment) { if( isset($attachment[\'license_field\']) ){ update_post_meta($post[\'ID\'], \'license_field\', sanitize_text_field( $attachment[\'license_field\'] ) ); }else{ delete_post_meta($post[\'ID\'], \'license_field\' ); } return $post; } add_filter(\'attachment_fields_to_save\', \'save_custom_field_license\', null, 2);

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