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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 |
|---|---|
| 515 | |
| 516 | /** |
| 517 | * Fires after a site is fully upgraded. |
| 518 | * |
| 519 | * @since 3.9.0 |
| 520 | * |
| 521 | * @param int $wp_db_version The new $wp_db_version. |
| 522 | * @param int $wp_current_db_version The old (current) $wp_db_version. |
| 523 | */ |
| 524 | do_action( 'wp_upgrade', $wp_db_version, $wp_current_db_version ); |
| 525 | } |
| 526 | endif; |
| 527 | |
| 528 | /** |
| 529 | * Functions to be called in installation and upgrade scripts. |
| 530 | * |
| 531 | * Contains conditional checks to determine which upgrade scripts to run, |
| 532 | * based on database version and WP version being updated-to. |
| 533 | * |