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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 |
|---|---|
| 174 | } |
| 175 | |
| 176 | /* Options functions */ |
| 177 | |
| 178 | // expects $setting to already be SQL-escaped |
| 179 | function get_option($setting) { |
| 180 | global $wpdb; |
| 181 | |
| 182 | // Allow plugins to short-circuit options. |
| 183 | $pre = apply_filters( 'pre_option_' . $setting, false ); |
| 184 | if ( false !== $pre ) |
| 185 | return $pre; |
| 186 | |
| 187 | // prevent non-existent options from triggering multiple queries |
| 188 | $notoptions = wp_cache_get('notoptions', 'options'); |
| 189 | if ( isset($notoptions[$setting]) ) |
| 190 | return false; |
| 191 | |
| 192 | $alloptions = wp_load_alloptions(); |