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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 |
|---|---|
| 783 | $value = $row->meta_value; |
| 784 | $value = maybe_unserialize( $value ); |
| 785 | wp_cache_set( $cache_key, $value, 'site-options' ); |
| 786 | } else { |
| 787 | $value = apply_filters( 'default_site_option_' . $option, $default ); |
| 788 | } |
| 789 | } |
| 790 | } |
| 791 | |
| 792 | return apply_filters( 'site_option_' . $option, $value ); |
| 793 | } |
| 794 | |
| 795 | /** |
| 796 | * Add a new site option. |
| 797 | * |
| 798 | * Existing options will not be updated. Note that prior to 3.3 this wasn't the case. |
| 799 | * |
| 800 | * @see add_option() |
| 801 | * @package WordPress |