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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 |
|---|---|
| 338 | |
| 339 | /** |
| 340 | * Fires after a site is fully upgraded. |
| 341 | * |
| 342 | * @since 3.9.0 |
| 343 | * |
| 344 | * @param int $wp_db_version The new $wp_db_version. |
| 345 | * @param int $wp_current_db_version The old (current) $wp_db_version. |
| 346 | */ |
| 347 | do_action( 'wp_upgrade', $wp_db_version, $wp_current_db_version ); |
| 348 | } |
| 349 | endif; |
| 350 | |
| 351 | /** |
| 352 | * Functions to be called in install and upgrade scripts. |
| 353 | * |
| 354 | * {@internal Missing Long Description}} |
| 355 | * |
| 356 | * @since 1.0.1 |