Creates image sub-sizes, adds the new data to the image meta sizes array, and updates the image metadata.
Intended for use after an image is uploaded. Saves/updates the image metadata after each sub-size is created. If there was an error, it is added to the returned image metadata array.
function wp_create_image_subsizes( $file, $attachment_id ) {
$imagesize = wp_getimagesize( $file );
if ( empty( $imagesize ) ) {
// File is not an image.
return array();
}
// Default image meta.
$image_meta = array(
'width' => $imagesize[0],
'height' => $imagesize[1],
'file' => _wp_relative_upload_path( $file ),
'filesize' => wp_filesize( $file ),
'sizes' => array(),
);
// Fetch additional metadata from EXIF/IPTC.
$exif_meta = wp_read_image_metadata( $file );
if ( $exif_meta ) {
$image_meta['image_meta'] = $exif_meta;
}
// Do not scale (large) PNG images. May result in sub-sizes that have greater file size than the original. See #48736.
if ( 'image/png' !== $imagesize['mime'] ) {
/**
* Filters the "BIG image" threshold value.
*
* If the original image width or height is above the threshold, it will be scaled down. The threshold is
* used as max width and max height. The scaled down image will be used as the largest available size, including
* the `_wp_attached_file` post meta value.
*
* Returning `false` from the filter callback will disable the scaling.
*
* @since 5.3.0
*
* @param int $threshold The threshold value in pixels. Default 2560.
* @param array $imagesize {
* Indexed array of the image width and height in pixels.
*
* @type int $0 The image width.
* @type int $1 The image height.
* }
* @param string $file Full path to the uploaded image file.
* @param int $attachment_id Attachment post ID.
*/
$threshold = (int) apply_filters( 'big_image_size_threshold', 2560, $imagesize, $file, $attachment_id );
/*
* If the original image's dimensions are over the threshold,
* scale the image and use it as the "full" size.
*/
if ( $threshold && ( $image_meta['width'] > $threshold || $image_meta['height'] > $threshold ) ) {
$editor = wp_get_image_editor( $file );
if ( is_wp_error( $editor ) ) {
// This image cannot be edited.
return $image_meta;
}
// Resize the image.
$resized = $editor->resize( $threshold, $threshold );
$rotated = null;
// If there is EXIF data, rotate according to EXIF Orientation.
if ( ! is_wp_error( $resized ) && is_array( $exif_meta ) ) {
$resized = $editor->maybe_exif_rotate();
$rotated = $resized;
}
if ( ! is_wp_error( $resized ) ) {
/*
* Append "-scaled" to the image file name. It will look like "my_image-scaled.jpg".
* This doesn't affect the sub-sizes names as they are generated from the original image (for best quality).
*/
$saved = $editor->save( $editor->generate_filename( 'scaled' ) );
if ( ! is_wp_error( $saved ) ) {
$image_meta = _wp_image_meta_replace_original( $saved, $file, $image_meta, $attachment_id );
// If the image was rotated update the stored EXIF data.
if ( true === $rotated && ! empty( $image_meta['image_meta']['orientation'] ) ) {
$image_meta['image_meta']['orientation'] = 1;
}
} else {
// TODO: Log errors.
}
} else {
// TODO: Log errors.
}
} elseif ( ! empty( $exif_meta['orientation'] ) && 1 !== (int) $exif_meta['orientation'] ) {
// Rotate the whole original image if there is EXIF data and "orientation" is not 1.
$editor = wp_get_image_editor( $file );
if ( is_wp_error( $editor ) ) {
// This image cannot be edited.
return $image_meta;
}
// Rotate the image.
$rotated = $editor->maybe_exif_rotate();
if ( true === $rotated ) {
// Append `-rotated` to the image file name.
$saved = $editor->save( $editor->generate_filename( 'rotated' ) );
if ( ! is_wp_error( $saved ) ) {
$image_meta = _wp_image_meta_replace_original( $saved, $file, $image_meta, $attachment_id );
// Update the stored EXIF data.
if ( ! empty( $image_meta['image_meta']['orientation'] ) ) {
$image_meta['image_meta']['orientation'] = 1;
}
} else {
// TODO: Log errors.
}
}
}
}
/*
* Initial save of the new metadata.
* At this point the file was uploaded and moved to the uploads directory
* but the image sub-sizes haven't been created yet and the `sizes` array is empty.
*/
wp_update_attachment_metadata( $attachment_id, $image_meta );
$new_sizes = wp_get_registered_image_subsizes();
/**
* Filters the image sizes automatically generated when uploading an image.
*
* @since 2.9.0
* @since 4.4.0 Added the `$image_meta` argument.
* @since 5.3.0 Added the `$attachment_id` argument.
*
* @param array $new_sizes Associative array of image sizes to be created.
* @param array $image_meta The image meta data: width, height, file, sizes, etc.
* @param int $attachment_id The attachment post ID for the image.
*/
$new_sizes = apply_filters( 'intermediate_image_sizes_advanced', $new_sizes, $image_meta, $attachment_id );
return _wp_make_subsizes( $new_sizes, $file, $image_meta, $attachment_id );
}