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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 |
---|---|
179 | * |
180 | * @since 4.9.0 |
181 | * |
182 | * @param true|WP_Error $retval True if the user should be added to the site, error |
183 | * object otherwise. |
184 | * @param int $user_id User ID. |
185 | * @param string $role User role. |
186 | * @param int $blog_id Site ID. |
187 | */ |
188 | $can_add_user = apply_filters( 'can_add_user_to_blog', true, $user_id, $role, $blog_id ); |
189 |
|
190 | if ( true !== $can_add_user ) { |
191 | restore_current_blog(); |
192 |
|
193 | if ( is_wp_error( $can_add_user ) ) { |
194 | return $can_add_user; |
195 | } |
196 |
|
197 | return new WP_Error( 'user_cannot_be_added', __( 'User cannot be added to this site.' ) ); |