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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.
This hook occurs 4 times in this file.
| Line | Code |
|---|---|
| 235 | return false; |
| 236 | |
| 237 | if ( empty($cache_settings) ) |
| 238 | $cache_settings = get_alloptions(); |
| 239 | |
| 240 | if ( empty($cache_nonexistantoptions) ) |
| 241 | $cache_nonexistantoptions = array(); |
| 242 | |
| 243 | if ('home' == $setting && '' == $cache_settings->home) |
| 244 | return apply_filters('option_' . $setting, $cache_settings->siteurl); |
| 245 | |
| 246 | if ( isset($cache_settings->$setting) ) : |
| 247 | return apply_filters('option_' . $setting, $cache_settings->$setting); |
| 248 | else : |
| 249 | // for these cases when we're asking for an unknown option |
| 250 | if ( isset($cache_nonexistantoptions[$setting]) ) |
| 251 | return false; |
| 252 | |
| 253 | $option = $wpdb->get_var("SELECT option_value FROM $wpdb->options WHERE option_name = '$setting'"); |
| 254 | |
| 255 | if (!$option) : |
| 256 | $cache_nonexistantoptions[$setting] = true; |
| 257 | return false; |
| 258 | endif; |
| 259 | |
| 260 | @ $kellogs = unserialize($option); |
| 261 | if ($kellogs !== FALSE) |
| 262 | return apply_filters('option_' . $setting, $kellogs); |
| 263 | else return apply_filters('option_' . $setting, $option); |
| 264 | endif; |
| 265 | } |
| 266 | |
| 267 | function get_option($option) { |
| 268 | return get_settings($option); |
| 269 | } |
| 270 | |
| 271 | function form_option($option) { |
| 272 | echo htmlspecialchars( get_option($option), ENT_QUOTES ); |