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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 |
|---|---|
| 316 | * @uses apply_filters() Calls 'option_$optionname' with the option name value. |
| 317 | * |
| 318 | * @param string $setting Name of option to retrieve. Should already be SQL-escaped |
| 319 | * @return mixed Value set for the option. |
| 320 | */ |
| 321 | function get_option( $setting, $default = false ) { |
| 322 | global $wpdb; |
| 323 | |
| 324 | // Allow plugins to short-circuit options. |
| 325 | $pre = apply_filters( 'pre_option_' . $setting, false ); |
| 326 | if ( false !== $pre ) |
| 327 | return $pre; |
| 328 | |
| 329 | // prevent non-existent options from triggering multiple queries |
| 330 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 331 | if ( isset( $notoptions[$setting] ) ) |
| 332 | return $default; |
| 333 | |
| 334 | $alloptions = wp_load_alloptions(); |