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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 |
---|---|
309 | // Make sure the option doesn't already exist. We can check the 'notoptions' cache before we ask for a db query |
310 | $notoptions = wp_cache_get( 'notoptions', 'options' ); |
311 | if ( !is_array( $notoptions ) || !isset( $notoptions[$option] ) ) |
312 | if ( false !== get_option( $option ) ) |
313 | return false; |
314 |
|
315 | $_value = $value; |
316 | $value = maybe_serialize( $value ); |
317 | $autoload = ( 'no' === $autoload ) ? 'no' : 'yes'; |
318 | do_action( 'add_option', $option, $_value ); |
319 | if ( ! defined( 'WP_INSTALLING' ) ) { |
320 | if ( 'yes' == $autoload ) { |
321 | $alloptions = wp_load_alloptions(); |
322 | $alloptions[$option] = $value; |
323 | wp_cache_set( 'alloptions', $alloptions, 'options' ); |
324 | } else { |
325 | wp_cache_set( $option, $value, 'options' ); |
326 | } |
327 | } |