WordPress函数wp_get_attachment_thumb_file()用法 获取附件缩略图(特色图像)文件路径

描述：

返回附件的缩略图(特色图像)文件路径

用法：

<?php wp_get_attachment_thumb_file( $attachment_id ); ?>

参数：

$attachment_id

(integer) (可选) 附件ID

默认值: 0

源文件：

$attachment_id

(integer) (可选) 附件ID

默认值: 0/**
* Retrieve thumbnail for an attachment.
*
* @since 2.1.0
*
* @param int $post_id Optional. Attachment ID. Default 0.
* @return string|false False on failure. Thumbnail file path on success.
*/
function wp_get_attachment_thumb_file( $post_id = 0 ) {
$post_id = (int) $post_id;
if ( !$post = get_post( $post_id ) )
return false;
if ( !is_array( $imagedata = wp_get_attachment_metadata( $post->ID ) ) )
return false;

$file = get_attached_file( $post->ID );

if ( !empty($imagedata['thumb']) && ($thumbfile = str_replace(basename($file), $imagedata['thumb'], $file)) && file_exists($thumbfile) ) {
/**
* Filter the attachment thumbnail file path.
*
* @since 2.1.0
*
* @param string $thumbfile File path to the attachment thumbnail.
* @param int $post_id Attachment ID.
*/
return apply_filters( 'wp_get_attachment_thumb_file', $thumbfile, $post->ID );
}
return false;
}