我编辑了代码
if (!function_exists(\'wp_generate_attachment_metadata\')){
require_once(ABSPATH . "wp-admin" . \'/includes/image.php\');
require_once(ABSPATH . "wp-admin" . \'/includes/file.php\');
require_once(ABSPATH . "wp-admin" . \'/includes/media.php\');
}
if ($_FILES) {
foreach ($_FILES as $file => $array) {
$mime = $_FILES[$file][\'type\'];
$filesize = $_FILES[$file][\'size\'];
$maxsizef = 524288;
if($filesize > $maxsizef) $error_array[] = \'error size, max file size = 500 KB\';
if(($mime != \'image/jpeg\') && ($mime != \'image/jpg\') && ($mime != \'image/png\')) $error_array[] =\'error type , please upload: jpg, jpeg, png\';
$attach_id = media_handle_upload( $file, $post_id );
}
}
if ($attach_id > 0){
//and if you want to set that image as Post then use:
update_post_meta($post_id,\'_thumbnail_id\',$attach_id);
}
这是工作。