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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 |
|---|---|
| 3195 | function add_site_option( $key, $value ) { |
| 3196 | $value = apply_filters( 'pre_add_site_option_' . $key, $value ); |
| 3197 | $result = add_option($key, $value); |
| 3198 | do_action( "add_site_option_{$key}", $key, $value ); |
| 3199 | return $result; |
| 3200 | } |
| 3201 | |
| 3202 | function delete_site_option( $key ) { |
| 3203 | $result = delete_option($key); |
| 3204 | do_action( "delete_site_option_{$key}", $key ); |
| 3205 | return $result; |
| 3206 | } |
| 3207 | |
| 3208 | // expects $key, $value not to be SQL escaped |
| 3209 | function update_site_option( $key, $value ) { |
| 3210 | $oldvalue = get_site_option( $key ); |
| 3211 | $value = apply_filters( 'pre_update_site_option_' . $key, $value, $oldvalue ); |
| 3212 | $result = update_option($key, $value); |
| 3213 | do_action( "update_site_option_{$key}", $key, $value ); |