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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 |
|---|---|
| 1345 | /** |
| 1346 | * Filters the header image attachment metadata. |
| 1347 | * |
| 1348 | * @since 3.9.0 |
| 1349 | * |
| 1350 | * @see wp_generate_attachment_metadata() |
| 1351 | * |
| 1352 | * @param array $metadata Attachment metadata. |
| 1353 | */ |
| 1354 | $metadata = apply_filters( 'wp_header_image_attachment_metadata', $metadata ); |
| 1355 | |
| 1356 | wp_update_attachment_metadata( $attachment_id, $metadata ); |
| 1357 | |
| 1358 | return $attachment_id; |
| 1359 | } |
| 1360 | |
| 1361 | /** |
| 1362 | * Gets attachment uploaded by Media Manager, crops it, then saves it as a |
| 1363 | * new object. Returns JSON-encoded object details. |