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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 |
|---|---|
| 443 | $options = $wpdb->get_results( "SELECT option_name, option_value FROM $wpdb->options" ); |
| 444 | $wpdb->show_errors($show); |
| 445 | |
| 446 | foreach ( (array) $options as $option ) { |
| 447 | // "When trying to design a foolproof system, |
| 448 | // never underestimate the ingenuity of the fools :)" -- Dougal |
| 449 | if ( in_array( $option->option_name, array( 'siteurl', 'home', 'category_base', 'tag_base' ) ) ) |
| 450 | $option->option_value = untrailingslashit( $option->option_value ); |
| 451 | $value = maybe_unserialize( $option->option_value ); |
| 452 | $all_options->{$option->option_name} = apply_filters( 'pre_option_' . $option->option_name, $value ); |
| 453 | } |
| 454 | return apply_filters( 'all_options', $all_options ); |
| 455 | } |
| 456 | |
| 457 | /** |
| 458 | * Loads and caches all autoloaded options, if available or all options. |
| 459 | * |
| 460 | * This is different from get_alloptions(), in that this function will cache the |
| 461 | * options and will return the cached options when called again. |