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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 |
|---|---|
| 517 | return false; |
| 518 | |
| 519 | wp_protect_special_option( $option ); |
| 520 | |
| 521 | if ( is_object($newvalue) ) |
| 522 | $newvalue = clone $newvalue; |
| 523 | |
| 524 | $newvalue = sanitize_option( $option, $newvalue ); |
| 525 | $oldvalue = get_option( $option ); |
| 526 | $newvalue = apply_filters( 'pre_update_option_' . $option, $newvalue, $oldvalue ); |
| 527 | |
| 528 | // If the new and old values are the same, no need to update. |
| 529 | if ( $newvalue === $oldvalue ) |
| 530 | return false; |
| 531 | |
| 532 | if ( false === $oldvalue ) |
| 533 | return add_option( $option, $newvalue ); |
| 534 | |
| 535 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |