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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 |
|---|---|
| 219 | return false; |
| 220 | |
| 221 | wp_protect_special_option( $option ); |
| 222 | |
| 223 | if ( is_object( $value ) ) |
| 224 | $value = clone $value; |
| 225 | |
| 226 | $value = sanitize_option( $option, $value ); |
| 227 | $old_value = get_option( $option ); |
| 228 | $value = apply_filters( 'pre_update_option_' . $option, $value, $old_value ); |
| 229 | |
| 230 | // If the new and old values are the same, no need to update. |
| 231 | if ( $value === $old_value ) |
| 232 | return false; |
| 233 | |
| 234 | if ( false === $old_value ) |
| 235 | return add_option( $option, $value ); |
| 236 | |
| 237 | $serialized_value = maybe_serialize( $value ); |