WordPress Code Reference

wp_generate_attachment_metadata

Summery Summery

Filters the generated attachment meta data.

apply_filters( 'wp_generate_attachment_metadata', array $metadata, int $attachment_id, string $context )

$metadata: An array of attachment meta data.
$attachment_id: Current attachment ID.
$context: Additional context. Can be 'create' when metadata was initially created for new attachment or 'update' when the metadata was updated.

Changelog
Version	Description
5.3.0	The `$context` parameter was added.
2.1.0	Introduced.