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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 |
|---|---|
| 3307 | if ( 'attachment' === $post_type ) { |
| 3308 | /** |
| 3309 | * Filter attachment post data before it is updated in or added to the database. |
| 3310 | * |
| 3311 | * @since 3.9.0 |
| 3312 | * |
| 3313 | * @param array $data An array of sanitized attachment post data. |
| 3314 | * @param array $postarr An array of unsanitized attachment post data. |
| 3315 | */ |
| 3316 | $data = apply_filters( 'wp_insert_attachment_data', $data, $postarr ); |
| 3317 | } else { |
| 3318 | /** |
| 3319 | * Filter slashed post data just before it is inserted into the database. |
| 3320 | * |
| 3321 | * @since 2.7.0 |
| 3322 | * |
| 3323 | * @param array $data An array of slashed post data. |
| 3324 | * @param array $postarr An array of sanitized, but otherwise unmodified post data. |
| 3325 | */ |