Trying to generate WordPress thumbnails programmatically - php

Question

I'm trying to add a bunch of posts programmatically, and then add their attendant images. I have an array with all the image filenames in it, and I've been able to add them to the database, but I can't seem to get the proper thumbnails created.
The posts are coming from a csv located in wp-content/uploads/dirname/. They have numbers in their filenames which correspond to an ID in the CSV, which is how I know what images need to be added to what post id.
I've gotten the wp_insert_attachment() part to work with the images right there in their own little directory, but I couldn't get the thumbnails to generate. I installed the regenerate thumbnails plugin, and it was able to generate them, but I can't seem to get it to happen programmatically.
I thought that might be because wp_generate_attachment needs the photos to be in /uploads/2011/12/ (e.g.), so I started down the path of moving the images and then trying to add them. This makes sense anyway because I kinda want to make copies rather than have 5 or 6 different media sizes added to my wp-content/uploads/dirname/ dir.
Anyway, it doesn't work. Moving the images via PHP's copy doesn't work, and the thumbnails don't generate.
foreach ($frazerfiles[$stock_num] as $stock_img){
require_once(ABSPATH . 'wp-admin/includes/image.php');
echo "... ...Trying to add attachment metadata...";
// copy the file to the upload dir
$uploads = wp_upload_dir();
$file_to_move = ABSPATH."wp-content/uploads/".$stock_img;
if (copy($file_to_move, $uploads['path']."/")) {
echo "Moved $file_to_move to ".$uploads['path']."/";
$my_moved_file = $uploads['path']."/".$stock_img;
// I think this is failing because the images aren't in the upload dir.
$attachment = array(
'post_mime_type' => $wp_filetype['type'],
'post_title' => preg_replace('/\.[^.]+$/', '', basename($stock_img)),
'post_content' => '',
'post_status' => 'inherit'
);
if ($attach_id = wp_insert_attachment( $attachment, $my_moved_file, $newpostid )) {
if ($attach_data = wp_generate_attachment_metadata( $attach_id, $my_moved_file)) {
echo "...success for $my_moved_file: ID:$attach_id<br />\n";
} else {
echo "...FAILED for $my_moved_file ID:$attach_id<br />\n";
print_r($attach_data);
}
} else { // inserting attachment failed
echo "Insert attachment failed for $my_moved_file to $newpostid<br />\n";
}
} else {
echo "Failed moving $file_to_move to ".$uploads['path']."/";
}
}// images foreach

Answer 1

After cross checking with WordPress core files, the only thing that seems to be missing out is wp_update_attachment_metadata immediately after wp_generate_attachment_metadata.
Try adding
wp_update_attachment_metadata($attach_id, $attach_data);
after
echo "...success for $my_moved_file: ID:$attach_id<br />\n";
So the if block looks like
if ($attach_data = wp_generate_attachment_metadata( $attach_id, $my_moved_file)) {
echo "...success for $my_moved_file: ID:$attach_id<br />\n";
wp_update_attachment_metadata($attach_id, $attach_data);
} else {
echo "...FAILED for $my_moved_file ID:$attach_id<br />\n";
print_r($attach_data);
}
Suggestion: (not related to the question)
move the line
require_once(ABSPATH . 'wp-admin/includes/image.php');
outside(above) the for loop.
UPDATE 1:
Adding suggestion to fix the copy issue.
You missed out the "check the file type" line.
(PHP copy function will fail if the destination file($my_moved_file) already exists)
Change this code
// copy the file to the upload dir
$uploads = wp_upload_dir();
$file_to_move = ABSPATH."wp-content/uploads/".$stock_img;
if (copy($file_to_move, $uploads['path']."/")) {
echo "Moved $file_to_move to ".$uploads['path']."/";
$my_moved_file = $uploads['path']."/".$stock_img;
// I think this is failing because the images aren't in the upload dir.
$attachment = array(
'post_mime_type' => $wp_filetype['type'],
'post_title' => preg_replace('/\.[^.]+$/', '', basename($stock_img)),
'post_content' => '',
'post_status' => 'inherit'
);
TO
// copy the file to the upload dir
$uploads = wp_upload_dir();
$file_to_move = ABSPATH."wp-content/uploads/".$stock_img;
$my_moved_file = $uploads['path']."/".$stock_img;
if (copy($file_to_move, $my_moved_file)) {
echo "Moved $file_to_move to ".$my_moved_file;
// Check the file type
$wp_filetype = wp_check_filetype(basename($my_moved_file), null );
$attachment = array(
'post_mime_type' => $wp_filetype['type'],
'post_title' => preg_replace('/\.[^.]+$/', '', basename($my_moved_file)),
'post_content' => '',
'post_status' => 'inherit'
);