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The best way to understand what a hook does is to look at where it occurs in the source code.
do_action( "hook_name" )apply_filters( "hook_name", "what_to_filter" ).Remember, this hook may occur in more than one file. Moreover, the hook's context may change from version to version.
| Line | Code |
|---|---|
| 200 | /** |
| 201 | * Filters the parameters for the attachment thumbnail creation. |
| 202 | * |
| 203 | * @since 3.9.0 |
| 204 | * |
| 205 | * @param array $image_attachment An array of parameters to create the thumbnail. |
| 206 | * @param array $metadata Current attachment metadata. |
| 207 | * @param array $uploaded An array containing the thumbnail path and url. |
| 208 | */ |
| 209 | $image_attachment = apply_filters( 'attachment_thumbnail_args', $image_attachment, $metadata, $uploaded ); |
| 210 | |
| 211 | $sub_attachment_id = wp_insert_attachment( $image_attachment, $uploaded['file'] ); |
| 212 | add_post_meta( $sub_attachment_id, '_cover_hash', $hash ); |
| 213 | $attach_data = wp_generate_attachment_metadata( $sub_attachment_id, $uploaded['file'] ); |
| 214 | wp_update_attachment_metadata( $sub_attachment_id, $attach_data ); |
| 215 | update_post_meta( $attachment_id, '_thumbnail_id', $sub_attachment_id ); |
| 216 | } |
| 217 | } |
| 218 | } elseif ( 'application/pdf' === $mime_type ) { |