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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 5 times in this file.
| Line | Code |
|---|---|
| 155 | * @since 3.4.0 |
| 156 | * @since 4.4.0 The `$option` parameter was added. |
| 157 | * @since 4.7.0 The `$passed_default` parameter was added to distinguish between a `false` value and the default parameter value. |
| 158 | * |
| 159 | * @param mixed $default The default value to return if the option does not exist |
| 160 | * in the database. |
| 161 | * @param string $option Option name. |
| 162 | * @param bool $passed_default Was `get_option()` passed a default value? |
| 163 | */ |
| 164 | return apply_filters( "default_option_{$option}", $default, $option, $passed_default ); |
| 165 | } |
| 166 | |
| 167 | $alloptions = wp_load_alloptions(); |
| 168 | |
| 169 | if ( isset( $alloptions[ $option ] ) ) { |
| 170 | $value = $alloptions[ $option ]; |
| 171 | } else { |
| 172 | $value = wp_cache_get( $option, 'options' ); |
| 173 | |
| Line | Code |
| 181 | } else { // Option does not exist, so we must cache its non-existence. |
| 182 | if ( ! is_array( $notoptions ) ) { |
| 183 | $notoptions = array(); |
| 184 | } |
| 185 | |
| 186 | $notoptions[ $option ] = true; |
| 187 | wp_cache_set( 'notoptions', $notoptions, 'options' ); |
| 188 | |
| 189 | /** This filter is documented in wp-includes/option.php */ |
| 190 | return apply_filters( "default_option_{$option}", $default, $option, $passed_default ); |
| 191 | } |
| 192 | } |
| 193 | } |
| 194 | } else { |
| 195 | $suppress = $wpdb->suppress_errors(); |
| 196 | $row = $wpdb->get_row( $wpdb->prepare( "SELECT option_value FROM $wpdb->options WHERE option_name = %s LIMIT 1", $option ) ); |
| 197 | $wpdb->suppress_errors( $suppress ); |
| 198 | |
| 199 | if ( is_object( $row ) ) { |
| 200 | $value = $row->option_value; |
| 201 | } else { |
| 202 | /** This filter is documented in wp-includes/option.php */ |
| 203 | return apply_filters( "default_option_{$option}", $default, $option, $passed_default ); |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | // If home is not set, use siteurl. |
| 208 | if ( 'home' === $option && '' === $value ) { |
| 209 | return get_option( 'siteurl' ); |
| 210 | } |
| 211 | |
| 212 | if ( in_array( $option, array( 'siteurl', 'home', 'category_base', 'tag_base' ), true ) ) { |
| Line | Code |
| 457 | * unnecessary database calls for otherwise identical object instances. |
| 458 | * |
| 459 | * See https://core.trac.wordpress.org/ticket/38903 |
| 460 | */ |
| 461 | if ( $value === $old_value || maybe_serialize( $value ) === maybe_serialize( $old_value ) ) { |
| 462 | return false; |
| 463 | } |
| 464 | |
| 465 | /** This filter is documented in wp-includes/option.php */ |
| 466 | if ( apply_filters( "default_option_{$option}", false, $option, false ) === $old_value ) { |
| 467 | // Default setting for new options is 'yes'. |
| 468 | if ( null === $autoload ) { |
| 469 | $autoload = 'yes'; |
| 470 | } |
| 471 | |
| 472 | return add_option( $option, $value, '', $autoload ); |
| 473 | } |
| 474 | |
| 475 | $serialized_value = maybe_serialize( $value ); |
| Line | Code |
| 613 | |
| 614 | $value = sanitize_option( $option, $value ); |
| 615 | |
| 616 | // Make sure the option doesn't already exist. |
| 617 | // We can check the 'notoptions' cache before we ask for a DB query. |
| 618 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 619 | |
| 620 | if ( ! is_array( $notoptions ) || ! isset( $notoptions[ $option ] ) ) { |
| 621 | /** This filter is documented in wp-includes/option.php */ |
| 622 | if ( apply_filters( "default_option_{$option}", false, $option, false ) !== get_option( $option ) ) { |
| 623 | return false; |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | $serialized_value = maybe_serialize( $value ); |
| 628 | $autoload = ( 'no' === $autoload || false === $autoload ) ? 'no' : 'yes'; |
| 629 | |
| 630 | /** |
| 631 | * Fires before an option is added. |