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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 |
|---|---|
| 577 | // Make sure the option doesn't already exist. We can check the 'notoptions' cache before we ask for a db query |
| 578 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
| 579 | if ( !is_array( $notoptions ) || !isset( $notoptions[$option] ) ) |
| 580 | if ( false !== get_option( $option ) ) |
| 581 | return; |
| 582 | |
| 583 | $_value = $value; |
| 584 | $value = maybe_serialize( $value ); |
| 585 | $autoload = ( 'no' === $autoload ) ? 'no' : 'yes'; |
| 586 | do_action( 'add_option', $option, $_value ); |
| 587 | if ( ! defined( 'WP_INSTALLING' ) ) { |
| 588 | if ( 'yes' == $autoload ) { |
| 589 | $alloptions = wp_load_alloptions(); |
| 590 | $alloptions[$option] = $value; |
| 591 | wp_cache_set( 'alloptions', $alloptions, 'options' ); |
| 592 | } else { |
| 593 | wp_cache_set( $option, $value, 'options' ); |
| 594 | } |
| 595 | } |