我用的是伊恩·斯图尔特的Sample Theme Options 用于轻量级主题选项面板。

插入失败

我需要在db中插入多个类别，我使用了以下代码：

<select multiple="multiple" name="site_options[categorychoice]">
   <?php
   $args = array(
        \'orderby\' => \'name\',
        \'parent\' => 0,
        \'exclude\' => 1
     );
   $categories = get_categories( $args );
   foreach ($categories as $category) { ?>
        <option value="<?php echo $category->term_id; ?>" style="padding-right: 10px;" <?php selected( $site_options[\'categorychoice\'], $category->term_id ); ?> ><?php echo $category->cat_name . \' (\' . $category->category_count .\')\'; ?></option>
   <?php }  ?>
</select>

在代码的验证部分：

function theme_options_validate( $input ) {
   $got_categories = array( $input[\'categorychoice\'] );
}

它是在选项表中插入数据，但不是多个，它只是插入最后一个选择。所以我得到的是：\'categorychoice\' => string \'5\' (length=1) — 所有值中只有一个值，这是所选中的最后一个cat\\U id。

SELECTED=SELECTED失败

当数据与db匹配时，我也无法选择值。我试过我的代码This WPSE solution, 但失败了：

foreach ($categories as $category) { ?>
     <?php $selected = in_array( $category->cat_ID, $selected ) ? \' selected="selected" \' : \'\' ?>
     <option value="<?php echo $category->term_id; ?>" style="padding-right: 10px;" <?php echo $selected; ?> ><?php echo $category->cat_name . \' (\' . $category->category_count .\')\'; ?></option>
<?php } ?>

<select multiple="multiple" name="site_options[categorychoice][]">
   <?php $option = get_option(\'site_options\'); ?>
   <?php
   $args = array(
     \'orderby\' => \'name\',
     \'parent\' => 0,
     \'exclude\' => 1
   );
   $categories = get_categories( $args );
   foreach ($categories as $category) { ?>
   <?php $selected = in_array( $category->cat_ID, $option[\'categorychoice\'] ) ? \' selected="selected" \' : \'\'; ?>
       <option value="<?php echo $category->term_id; ?>" <?php echo $selected; ?> >
          <?php echo $category->cat_name . \' (\' . $category->category_count .\')\'; ?>
       </option>
   <?php } //endforeach ?>
</select>

<select multiple="multiple" name="site_options[categorychoice][]">

<?php $option = get_option(\'site_options\'); ?>

<?php $selected = in_array( $category->cat_ID, $option[\'categorychoice\'] ) ? \' selected="selected" \' : \'\'; ?>

<option <?php echo $selected; ?> >