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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 |
|---|---|
| 557 | * @param array $metadata Current attachment metadata. |
| 558 | * @param array $uploaded { |
| 559 | * Information about the newly-uploaded file. |
| 560 | * |
| 561 | * @type string $file Filename of the newly-uploaded file. |
| 562 | * @type string $url URL of the uploaded file. |
| 563 | * @type string $type File type. |
| 564 | * } |
| 565 | */ |
| 566 | $image_attachment = apply_filters( 'attachment_thumbnail_args', $image_attachment, $metadata, $uploaded ); |
| 567 | |
| 568 | $sub_attachment_id = wp_insert_attachment( $image_attachment, $uploaded['file'] ); |
| 569 | add_post_meta( $sub_attachment_id, '_cover_hash', $hash ); |
| 570 | $attach_data = wp_generate_attachment_metadata( $sub_attachment_id, $uploaded['file'] ); |
| 571 | wp_update_attachment_metadata( $sub_attachment_id, $attach_data ); |
| 572 | update_post_meta( $attachment_id, '_thumbnail_id', $sub_attachment_id ); |
| 573 | } |
| 574 | } |
| 575 | } elseif ( 'application/pdf' === $mime_type ) { |