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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 |
|---|---|
| 423 | |
| 424 | /** |
| 425 | * Fires after a site is fully upgraded. |
| 426 | * |
| 427 | * @since 3.9.0 |
| 428 | * |
| 429 | * @param int $wp_db_version The new $wp_db_version. |
| 430 | * @param int $wp_current_db_version The old (current) $wp_db_version. |
| 431 | */ |
| 432 | do_action( 'wp_upgrade', $wp_db_version, $wp_current_db_version ); |
| 433 | } |
| 434 | endif; |
| 435 | |
| 436 | /** |
| 437 | * Functions to be called in install and upgrade scripts. |
| 438 | * |
| 439 | * Contains conditional checks to determine which upgrade scripts to run, |
| 440 | * based on database version and WP version being updated-to. |
| 441 | * |