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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 |
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1386 | * @param mixed $pre_option The value to return instead of the option value. This differs |
1387 | * from `$default`, which is used as the fallback value in the event |
1388 | * the option doesn't exist elsewhere in get_network_option(). |
1389 | * Default false (to skip past the short-circuit). |
1390 | * @param string $option Option name. |
1391 | * @param int $network_id ID of the network. |
1392 | * @param mixed $default The fallback value to return if the option does not exist. |
1393 | * Default false. |
1394 | */ |
1395 | $pre = apply_filters( "pre_site_option_{$option}", false, $option, $network_id, $default ); |
1396 |
|
1397 | if ( false !== $pre ) { |
1398 | return $pre; |
1399 | } |
1400 |
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1401 | // Prevent non-existent options from triggering multiple queries. |
1402 | $notoptions_key = "$network_id:notoptions"; |
1403 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |
1404 |
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