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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 |
|---|---|
| 3574 | * request's cookies, if available. |
| 3575 | * |
| 3576 | * Returning a value of false will effectively short-circuit setting |
| 3577 | * the current user. |
| 3578 | * |
| 3579 | * @since 3.9.0 |
| 3580 | * |
| 3581 | * @param int|false $user_id User ID if one has been determined, false otherwise. |
| 3582 | */ |
| 3583 | $user_id = apply_filters( 'determine_current_user', false ); |
| 3584 | if ( ! $user_id ) { |
| 3585 | wp_set_current_user( 0 ); |
| 3586 | return $current_user; |
| 3587 | } |
| 3588 | |
| 3589 | wp_set_current_user( $user_id ); |
| 3590 | |
| 3591 | return $current_user; |
| 3592 | } |