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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 2 times in this file.
| Line | Code |
|---|---|
| 341 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 342 | if ( isset( $notoptions[$setting] ) ) { |
| 343 | wp_cache_set( $key, 'noop', 'site-options' ); |
| 344 | $value = $default; |
| 345 | } elseif ( $value == false ) { |
| 346 | wp_cache_set( $key, 'falsevalue', 'site-options' ); |
| 347 | } else { |
| 348 | wp_cache_set( $key, $value, 'site-options' ); |
| 349 | } |
| 350 | return apply_filters( 'blog_option_' . $setting, $value, $blog_id ); |
| 351 | } else { |
| 352 | $blog_prefix = $wpdb->get_blog_prefix( $blog_id ); |
| 353 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$blog_prefix}options WHERE option_name = %s", $setting ) ); |
| 354 | if ( is_object( $row ) ) { // Has to be get_row instead of get_var because of funkiness with 0, false, null values |
| 355 | $value = $row->option_value; |
| 356 | if ( $value == false ) |
| 357 | wp_cache_set( $key, 'falsevalue', 'site-options' ); |
| 358 | else |
| 359 | wp_cache_set( $key, $value, 'site-options' ); |
| Line | Code |
| 368 | $value = false; |
| 369 | } |
| 370 | // If home is not set use siteurl. |
| 371 | if ( 'home' == $setting && '' == $value ) |
| 372 | return get_blog_option( $blog_id, 'siteurl' ); |
| 373 | |
| 374 | if ( 'siteurl' == $setting || 'home' == $setting || 'category_base' == $setting ) |
| 375 | $value = untrailingslashit( $value ); |
| 376 | |
| 377 | return apply_filters( 'blog_option_' . $setting, maybe_unserialize( $value ), $blog_id ); |
| 378 | } |
| 379 | |
| 380 | /** |
| 381 | * Add an option for a particular blog. |
| 382 | * |
| 383 | * @since MU |
| 384 | * |
| 385 | * @param int $id The blog id |
| 386 | * @param string $key The option key |