wp_generate_attachment_metadata – Hook

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

Filters the generated attachment meta data.

Parameters

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

return apply_filters( 'wp_generate_attachment_metadata', $metadata, $attachment_id, 'create' );

Used by	Description
wp_update_image_subsizes()`wp-admin/includes/image.php`	If any of the currently registered image sub-sizes are missing, create them and update the image meta data.
wp_generate_attachment_metadata()`wp-admin/includes/image.php`	Generates attachment meta data and create image sub-sizes for images.

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

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