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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 |
|---|---|
| 108 | * request's cookies, if available. |
| 109 | * |
| 110 | * Returning a value of false will effectively short-circuit setting |
| 111 | * the current user. |
| 112 | * |
| 113 | * @since 3.9.0 |
| 114 | * |
| 115 | * @param int|bool $user_id User ID if one has been determined, false otherwise. |
| 116 | */ |
| 117 | $user_id = apply_filters( 'determine_current_user', false ); |
| 118 | if ( ! $user_id ) { |
| 119 | wp_set_current_user( 0 ); |
| 120 | return false; |
| 121 | } |
| 122 | |
| 123 | wp_set_current_user( $user_id ); |
| 124 | } |
| 125 | endif; |
| 126 | |