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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 |
|---|---|
| 229 | if ( isset( $user->{$wpdb->prefix . $option} ) ) // Blog specific |
| 230 | $result = $user->{$wpdb->prefix . $option}; |
| 231 | elseif ( isset( $user->{$option} ) ) // User specific and cross-blog |
| 232 | $result = $user->{$option}; |
| 233 | elseif ( $check_blog_options ) // Blog global |
| 234 | $result = get_option( $option ); |
| 235 | else |
| 236 | $result = false; |
| 237 | |
| 238 | return apply_filters("get_user_option_{$option}", $result, $option, $user); |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * Update user option with global blog capability. |
| 243 | * |
| 244 | * User options are just like user metadata except that they have support for |
| 245 | * global blog options. If the 'global' parameter is false, which it is by default |
| 246 | * it will prepend the WordPress table prefix to the option name. |
| 247 | * |