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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 |
|---|---|
| 548 | * |
| 549 | * Most of WP is loaded at this stage, and the user is authenticated. WP continues |
| 550 | * to load on the {@see 'init'} hook that follows (e.g. widgets), and many plugins instantiate |
| 551 | * themselves on it for all sorts of reasons (e.g. they need a user, a taxonomy, etc.). |
| 552 | * |
| 553 | * If you wish to plug an action once WP is loaded, use the {@see 'wp_loaded'} hook below. |
| 554 | * |
| 555 | * @since 1.5.0 |
| 556 | */ |
| 557 | do_action( 'init' ); |
| 558 | |
| 559 | // Check site status. |
| 560 | if ( is_multisite() ) { |
| 561 | $file = ms_site_check(); |
| 562 | if ( true !== $file ) { |
| 563 | require $file; |
| 564 | die(); |
| 565 | } |
| 566 | unset( $file ); |