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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 |
|---|---|
| 3694 | if ( 'attachment' === $post_type ) { |
| 3695 | /** |
| 3696 | * Filters attachment post data before it is updated in or added to the database. |
| 3697 | * |
| 3698 | * @since 3.9.0 |
| 3699 | * |
| 3700 | * @param array $data An array of sanitized attachment post data. |
| 3701 | * @param array $postarr An array of unsanitized attachment post data. |
| 3702 | */ |
| 3703 | $data = apply_filters( 'wp_insert_attachment_data', $data, $postarr ); |
| 3704 | } else { |
| 3705 | /** |
| 3706 | * Filters slashed post data just before it is inserted into the database. |
| 3707 | * |
| 3708 | * @since 2.7.0 |
| 3709 | * |
| 3710 | * @param array $data An array of slashed post data. |
| 3711 | * @param array $postarr An array of sanitized, but otherwise unmodified post data. |
| 3712 | */ |