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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 |
|---|---|
| 3887 | if ( 'attachment' === $post_type ) { |
| 3888 | /** |
| 3889 | * Filters attachment post data before it is updated in or added to the database. |
| 3890 | * |
| 3891 | * @since 3.9.0 |
| 3892 | * |
| 3893 | * @param array $data An array of sanitized attachment post data. |
| 3894 | * @param array $postarr An array of unsanitized attachment post data. |
| 3895 | */ |
| 3896 | $data = apply_filters( 'wp_insert_attachment_data', $data, $postarr ); |
| 3897 | } else { |
| 3898 | /** |
| 3899 | * Filters slashed post data just before it is inserted into the database. |
| 3900 | * |
| 3901 | * @since 2.7.0 |
| 3902 | * |
| 3903 | * @param array $data An array of slashed post data. |
| 3904 | * @param array $postarr An array of sanitized, but otherwise unmodified post data. |
| 3905 | */ |