WordPress上传文件存放到不同目录的方法
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>有时候将不同类型的文件分门别类存储，似乎比年月目录更有意义。例如幻灯片应该存储在slides目录下，下载文件应该存储在downloads文件夹下。就说幻灯片slideshow，我比较喜欢用自定义文章类型（Custom Post Type）实现，有些幻灯片脚本比较个性，不支持绝对路径，必须用相对路径，然后用base参数设置相对于哪个文件夹，这样幻灯片必须存储在某个特定的文件夹中，年月形式显然不满足要求。所以，我们需要条件化的设置上传目录。</p>
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<strong>一、为Custom Post Type设置上传目录</strong></p>
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假设我要将所有在幻灯片类型的文章中上传的文件存储到/wp-content/uploads/slides文件夹中，将下面的代码放到主题的functions.php中即可<br>
</p>
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<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
</div>
<p>
代码如下:</p>
</div>
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function custom_upload_directory( $uploads ) {<br>
$id = $_REQUEST['post_id'];<br>
$parent = get_post( $id )->post_parent;<br>
if( "post-type" == get_post_type( $id ) || "post-type" == get_post_type( $parent ) ) {<br>
$subdir = 'slides';<br>
$uploads['subdir'] = $subdir;<br>
$uploads['path'] = $uploads['basedir'].DIRECTORY_SEPARATOR.$subdir;<br>
$uploads['url'] = $uploads['baseurl'].'/'.$subdir;<br>
}<br>
return $uploads;<br>
}<br>
add_filter( 'upload_dir', 'custom_upload_directory' );</div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>将post-type替换成自己的自定义文章类型名称，将你要创建的子目录赋值给$subdir。</span></p>
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</p>
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<strong>二、将文件保存到插件目录</strong></p>
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下面的代码要用在插件中，文件会保存到插件目录下的uploads文件夹下。<br>
</p>
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<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
</div>
<p>
代码如下:</p>
</div>
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<br>
/**<br>
* Change Upload Directory for Custom Post-Type<br>
*<br>
* This will change the upload directory for a custom post-type. Attachments will<br>
* now be uploaded to an "uploads" directory within the folder of your plugin. Make<br>
* sure you swap out "post-type" in the if-statement with the appropriate value...<br>
*/<br>
function custom_upload_directory( $args ) {<br>
$id = $_REQUEST['post_id'];<br>
$parent = get_post( $id )->post_parent;<br>
// Check the post-type of the current post<br>
if( "post-type" == get_post_type( $id ) || "post-type" == get_post_type( $parent ) ) {<br>
$args['path'] = plugin_dir_path(__FILE__) . "uploads";<br>
$args['url'] = plugin_dir_url(__FILE__) . "uploads";<br>
$args['basedir'] = plugin_dir_path(__FILE__) . "uploads";<br>
$args['baseurl'] = plugin_dir_url(__FILE__) . "uploads";<br>
}<br>
return $args;<br>
}<br>
add_filter( 'upload_dir', 'custom_upload_directory' );</div>
<p>
<br style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'><span style='font-family: tahoma, arial, "Microsoft YaHei"; font-size: 14px;'>如果要以年月形式保存，修改一下代码即可</span></p>
<div style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
</div>
<p>
代码如下:</p>
</div>
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<br>
$args['path'] = plugin_dir_path(__FILE__) . "uploads" . $args['subdir'];<br>
$args['url'] = plugin_dir_url(__FILE__) . "uploads" . $args['subdir'];</div>
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</p>
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<strong>三、为后台管理页面设定upload_dir</strong><br>
用wp_editor在后台管理页面（比如用add_menu_page创建的页面）创建一个媒体上传功能，希望所有从该页面上传的文件都保存到wp-content/uploads/myfolder目录下。<br>
由 于ajax上传是直接调用wp-admin/async_upload.php文件，只能通过post_id获取post信息，而后台管理页面并非 post，所以判断什么时候应该更改upload_dir有些麻烦。此时，可以用采用判断页面referer的方法,用wp_get_referer() 函数获取引荐url，如果正好与我们的option page url想等，就更该目录。<br>
</p>
<div style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
</div>
<p>
代码如下:</p>
</div>
<div id="phpcode16" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
function custom_upload_directory( $uploads ) {<br>
if( wp_get_referer() == 'http://domain.com/wp-admin/admin.php?page=myoptionpage'){<br>
$subdir = 'myfolder';<br>
$uploads['subdir'] = $subdir;<br>
$uploads['path'] = $uploads['basedir'].DIRECTORY_SEPARATOR.$subdir;<br>
$uploads['url'] = $uploads['baseurl'].'/'.$subdir;<br>
}<br>
return $uploads;<br>
}<br>
add_filter( 'upload_dir', 'custom_upload_directory' );</div>
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</p>
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<strong>四、参考信息</strong></p>
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filter:upload_dir是在wp_upload_dir()函数中调用的</p>
<p style='margin: 0px; padding: 5px 0px; outline: none; font-size: 14px; line-height: 30px; font-family: tahoma, arial, "Microsoft YaHei";'>
$upload_dir = wp_upload_dir();<br>
</p>
<div style='margin: 3px auto 0px; padding: 0px 3px; outline: none; line-height: 21.6px; clear: both; border-width: 1px; border-style: solid; border-color: rgb(0, 153, 204); background: rgb(246, 251, 255); overflow: hidden; font-family: tahoma, arial, "Microsoft YaHei";'>
<div style="margin: 0px; padding: 0px; outline: none; float: right; line-height: 25.2px; font-size: 14px;">
<span style="line-height: 25.2px; cursor: pointer;"><u>复制代码</u></span>
</div>
<p>
代码如下:</p>
</div>
<div id="phpcode17" style='margin: 0px auto 3px; padding: 0px 3px; outline: none; line-height: 25.2px; font-size: 14px; clear: both; border-right: 1px solid rgb(0, 153, 204); background: rgb(221, 237, 251); overflow: hidden; border-left: 1px solid rgb(0, 153, 204); word-break: break-all; border-bottom: 1px solid rgb(0, 153, 204); word-wrap: break-word; font-family: tahoma, arial, "Microsoft YaHei";'>
<br>
$upload_dir now contains something like the following (if successful)<br>
Array (<br>
=> C:\path\to\wordpress\wp-content\uploads\2010\05<br>
=> http://example.com/wp-content/uploads/2010/05<br>
=> /2010/05<br>
=> C:\path\to\wordpress\wp-content\uploads<br>
=> http://example.com/wp-content/uploads<br>
=><br>
)</div>
<div>
</div>
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