如何从用户配置文件的下拉列表中保存多个选项

我使用此代码创建下拉列表，然后保存下拉列表选择的值：

<?php
// Display Fields 
add_action( \'show_user_profile\', \'add_multiple_choice_dropdown \' );
add_action( \'edit_user_profile\', \'add_multiple_choice_dropdown \' );

function add_multiple_choice_dropdown ( $user ) {
?>

<h3>Extra profile information</h3>

<table class="form-table"> 
<tr>
    <th><label for="multi_dropdown">The dropdown with multiple choices</label></th>
    <td>
        <?php 
        //get dropdown saved value
        $selected = esc_attr(get_user_meta( $user->ID, \'multi_dropdown\', true )); 
        ?>
    <select name="multi_dropdown" id="multi_dropdown" multiple>
            <option value="first_choice" <?php echo ($selected == "first_choice")?  \'selected="selected"\' : \'\' ?>>First Choice</option>
            <option value="second_choice" <?php echo ($selected == "second_choice")?  \'selected="selected"\' : \'\' ?>>Second Choice</option>
            <option value="third_choice" <?php echo ($selected == "third_choice")?  \'selected="selected"\' : \'\' ?>>Third Choice</option>
    </select>
    <p class="description">Choose from the options above.</p>
    </td>
</tr>
</table>

<?php
}

// Save fields
add_action( \'personal_options_update\', \'save_multiple_choices\' );
add_action( \'edit_user_profile_update\', \'save_multiple_choices\' );

function save_multiple_choices( $user_id )
{
if ( isset( $_POST[\'multi_dropdown\'] ) ) {
update_user_meta( $user_id, \'multi_dropdown\', $_POST[\'multi_dropdown\'] );
}
?>

但当然，它只保存一个值，因为我想我必须将下拉列表中选定的值保存在一个数组中。但我不知道怎么做。

有人能分享这些知识吗？

<?php // Display Fields add_action( \'show_user_profile\', \'add_multiple_choice_dropdown \' ); add_action( \'edit_user_profile\', \'add_multiple_choice_dropdown \' ); function add_multiple_choice_dropdown ( $user ) { $current_selections = get_user_meta( $user->ID, \'multi_dropdown\', true ); ?> <h3>Extra profile information</h3> <table class="form-table"> <tr> <th><label for="multi_dropdown" multiple="multiple">The dropdown with multiple choices</label></th> <td> <select name="multi_dropdown[]"> <option value="first_choice" <?php echo ( !empty( $current_selections ) && in_array( \'first_choice\', $current_selections ) ? \' selected="selected"\' : \'\' ) ?>>First Choice</option> <option value="second_choice" <?php echo ( !empty( $current_selections ) && in_array( \'second_choice\', $current_selections ) ? \' selected="selected"\' : \'\' ) ?>>Second Choice</option> <option value="third_choice" <?php echo ( !empty( $current_selections ) && in_array( \'second_choice\', $current_selections ) ? \' selected="selected"\' : \'\' ) ?>>Third Choice</option> </select> <p class="description">Choose from the options above.</p> </td> </tr> </table> <?php } // Save fields add_action( \'personal_options_update\', \'save_multiple_choices\' ); add_action( \'edit_user_profile_update\', \'save_multiple_choices\' ); function save_multiple_choices( $user_id ) { if ( isset( $_POST[\'multi_dropdown\'] ) ) { update_user_meta( $user_id, \'multi_dropdown\', $_POST[\'multi_dropdown\'] ); } } ?>

<?php // Display Fields add_action( \'show_user_profile\', \'add_multiple_choice_dropdown \' ); add_action( \'edit_user_profile\', \'add_multiple_choice_dropdown \' ); $current_selections = get_user_meta( $user->ID, \'multi_dropdown\', true ); ?> <h3>Extra profile information</h3> <table class="form-table"> <tr> <th><label for="multi_dropdown">The dropdown with multiple choices</label></th> <td> <select name="multi_dropdown[]" multiple> <option value="first_choice" <?php echo ( !empty( $current_selections ) && in_array( \'first_choice\', $current_selections ) ? \' selected="selected"\' : \'\' ) ?>>First Choice</option> <option value="second_choice" <?php echo ( !empty( $current_selections ) && in_array( \'second_choice\', $current_selections ) ? \' selected="selected"\' : \'\' ) ?>>Second Choice</option> <option value="third_choice" <?php echo ( !empty( $current_selections ) && in_array( \'second_choice\', $current_selections ) ? \' selected="selected"\' : \'\' ) ?>>Third Choice</option> </select> <p class="description">Choose from the options above.</p> </td> </tr> </table> <?php } // Save fields add_action( \'personal_options_update\', \'save_multiple_choices\' ); add_action( \'edit_user_profile_update\', \'save_multiple_choices\' ); function save_multiple_choices( $user_id ) { if ( isset( $_POST[\'multi_dropdown\'] ) ) { update_user_meta( $user_id, \'multi_dropdown\', $_POST[\'multi_dropdown\'] ); } } ?>

小码农CODE

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