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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 |
|---|---|
| 301 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 302 | if ( isset( $notoptions[$setting] ) ) { |
| 303 | wp_cache_set( $key, 'noop', 'site-options' ); |
| 304 | $value = $default; |
| 305 | } elseif ( $value == false ) { |
| 306 | wp_cache_set( $key, 'falsevalue', 'site-options' ); |
| 307 | } else { |
| 308 | wp_cache_set( $key, $value, 'site-options' ); |
| 309 | } |
| 310 | return apply_filters( 'blog_option_' . $setting, $value, $blog_id ); |
| 311 | } else { |
| 312 | $blog_prefix = $wpdb->get_blog_prefix( $blog_id ); |
| 313 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$blog_prefix}options WHERE option_name = %s", $setting ) ); |
| 314 | if ( is_object( $row ) ) { // Has to be get_row instead of get_var because of funkiness with 0, false, null values |
| 315 | $value = $row->option_value; |
| 316 | if ( $value == false ) |
| 317 | wp_cache_set( $key, 'falsevalue', 'site-options' ); |
| 318 | else |
| 319 | wp_cache_set( $key, $value, 'site-options' ); |
| Line | Code |
| 331 | if ( 'home' == $setting && '' == $value ) |
| 332 | return get_blog_option( $blog_id, 'siteurl' ); |
| 333 | |
| 334 | if ( 'siteurl' == $setting || 'home' == $setting || 'category_base' == $setting ) |
| 335 | $value = untrailingslashit( $value ); |
| 336 | |
| 337 | if (! @unserialize( $value ) ) |
| 338 | $value = stripslashes( $value ); |
| 339 | |
| 340 | return apply_filters( 'blog_option_' . $setting, maybe_unserialize( $value ), $blog_id ); |
| 341 | } |
| 342 | |
| 343 | function add_blog_option( $id, $key, $value ) { |
| 344 | $id = (int) $id; |
| 345 | |
| 346 | switch_to_blog($id); |
| 347 | add_option( $key, $value ); |
| 348 | restore_current_blog(); |
| 349 | wp_cache_set( $id."-".$key."-blog_option", $value, 'site-options' ); |