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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 |
|---|---|
| 537 | * |
| 538 | * Most of WP is loaded at this stage, and the user is authenticated. WP continues |
| 539 | * to load on the {@see 'init'} hook that follows (e.g. widgets), and many plugins instantiate |
| 540 | * themselves on it for all sorts of reasons (e.g. they need a user, a taxonomy, etc.). |
| 541 | * |
| 542 | * If you wish to plug an action once WP is loaded, use the {@see 'wp_loaded'} hook below. |
| 543 | * |
| 544 | * @since 1.5.0 |
| 545 | */ |
| 546 | do_action( 'init' ); |
| 547 | |
| 548 | // Check site status. |
| 549 | if ( is_multisite() ) { |
| 550 | $file = ms_site_check(); |
| 551 | if ( true !== $file ) { |
| 552 | require $file; |
| 553 | die(); |
| 554 | } |
| 555 | unset( $file ); |