$_FILES在使用wordpress自定义字段图像上传时为空，但是，它在核心php网站中工作 - $_FILES is empty when working with wordpress custom field image uploading but, its working in core php website

$_FILES is empty when working with wordpress custom field image uploading but, its working in core php website

<form enctype="multipart/form-data" method="post" action="uploader.php">
        <input type="file" name="pic" /><br />
        <input type="submit" value="Upload File" />
    </form>
$file_title = $_FILES["pic"]["name"];
echo "$file_title";

在wordpress functions.php文件;自定义字段方法有:

function credits_meta() {
  global $post;
 $custom = get_post_custom($post->ID);
 $designers = $custom["designers"][0];
 $developers = $custom["developers"][0];
 $producers = $custom["producers"][0];
 ?>
<form method="POST" enctype="multipart/form-data">
 <p><label>Designed By:</label><br />
 <textarea cols="50" rows="5" name="designers"><?php echo $designers; ?></textarea></p>
 <p><label>Built By:</label><br />
 <textarea cols="50" rows="5" name="developers"><?php echo $developers;  ?> </textarea></p>
 <p><label>Upload Image :</label><br />
 <input type="file" name="myPhoto" size="25"/></p>
 </form>
  <?php
  }
function save_details(){
 global $post;
 $target_path = get_bloginfo('template_directory')."/images/";
 $file_title = $_FILES["myPhoto"]["name"];
$new_file_title = "wp_".$file_title;
update_post_meta($post->ID, "year_completed", $_POST["year_completed"]);
update_post_meta($post->ID, "designers", $_POST["designers"]);
update_post_meta($post->ID, "developers", $_POST["developers"]);
update_post_meta($post->ID, "producers", $new_file_title);
}

当我尝试上面的代码与核心php它工作得很好，但是，当我尝试做同样的wordpress自定义字段图像上传:$ _FILES总是给空。

如果我使用$_POST["pic"];，它给出了图像的名称

我试着用print_r, var_dumb甚至在wordpress functions.php文件中检查这个:

  add_action('init', 'myfunction');
  function myfunction(){
    if($_FILES){
      die("something");
    }
  }

仍然是空的。我要上传的文件大小是153kb。

我的php.ini文件:

file_uploads = on;
upload_max_filesize = 2M

如有任何帮助，不胜感激

在functions.php文件中添加以下钩子可以解决这个问题。

add_action( 'post_edit_form_tag' , 'post_edit_form_tag' );
function post_edit_form_tag( ) {
   echo ' enctype="multipart/form-data"';
}

remove action

<form enctype="multipart/form-data" method="post" action="">