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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 |
|---|---|
| 3344 | if ( 'attachment' === $post_type ) { |
| 3345 | /** |
| 3346 | * Filter attachment post data before it is updated in or added to the database. |
| 3347 | * |
| 3348 | * @since 3.9.0 |
| 3349 | * |
| 3350 | * @param array $data An array of sanitized attachment post data. |
| 3351 | * @param array $postarr An array of unsanitized attachment post data. |
| 3352 | */ |
| 3353 | $data = apply_filters( 'wp_insert_attachment_data', $data, $postarr ); |
| 3354 | } else { |
| 3355 | /** |
| 3356 | * Filter slashed post data just before it is inserted into the database. |
| 3357 | * |
| 3358 | * @since 2.7.0 |
| 3359 | * |
| 3360 | * @param array $data An array of slashed post data. |
| 3361 | * @param array $postarr An array of sanitized, but otherwise unmodified post data. |
| 3362 | */ |