我使用wordpress作为cms。我想从我的wordpress站点的前端通过表单插入自定义数据，然后在某个页面上的某个地方回显它。学习之后here and there 我能够把一个代码放在一起，在它下面工作。下面是我的表单当前的代码。

<form id="costing_submit_form" action="http://somesite.com/..../process-costing.php" method="post">
<input type="hidden" name="costing_submit_date" value="<?php echo $costing_submit_date;?>"/>        
<input type="text" id="costing_submit_title" name="costing_submit_title" size="90%" maxlength="150" /><br>
<textarea id="costing_submit_description" name="costing_submit_description" size="90%" cols="60" rows="10 tabindex="15" maxlength="2000" rows="20" required="" /></textarea>    
<input type="submit" class="costing_submit_button" name="costing_submit_button" value="SUBMIT COSTING" />
</form>

此时，我可以插入数据并使用$wpdb在前端显示它。这部分代码位于process-costing.php 将数据插入数据库表中。

global $wpdb; 
    require_once(\'../../../wp-load.php\');
    $costing_submit_date        = strip_tags($_POST[\'costing_submit_date\']);
    $costing_submit_title       = strip_tags($_POST[\'costing_submit_title\']);
    $costing_submit_description = strip_tags($_POST[\'costing_submit_description\']);
    $table_name = $wpdb->prefix . "costing";
    $wpdb->insert( $table_name, array(
    \'costing_date\' => $costing_submit_date,
    \'costing_title\' => $costing_submit_title,
    \'costing_description\' => $costing_submit_description,
    ));

现在，我想add an image to every entry made, 那么我该怎么做呢。如果没有一个完整的解决方案，请给我一个路线图，说明我应该做什么或遵循什么，我应该使用什么具体功能？即使我可以上传图片。我主要关心的是associate the uploaded image to that particular entry...可能是像post缩略图之类的？如果可能的话，我也想assign a particular folder 这些图像。提前谢谢。

<?php
$my_costing_id; /* contains the id of the corresponding item in your costing table */

// create attachment
$attachment_data = array(
    \'post_title\' => \'An Image\', 
    \'post_content\' => \'An Image\', 
    \'post_status\' => \'publish\', 
    \'post_mime_type\' => \'image/jpeg\', 
);
$attachment_id = wp_insert_attachment($attachment_data , \'path/to/uploaded/file.jpg\' );

update_post_meta( $attachment_id , \'_costing_id\' , $my_costing_id );

<?php
$attachment_id = $wpdb->get_var( $wpdb->prepare("SELECT post_id FROM $wpdb->postmeta WHERE meta_value=%d AND meta_key=%s") , $costing_id , \'_costing_id\' );