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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 |
|---|---|
| 1106 | * @since 2.9.0 As 'pre_site_option_' . $key |
| 1107 | * @since 3.0.0 |
| 1108 | * @since 4.4.0 The `$option` parameter was added. |
| 1109 | * @since 4.7.0 The `$network_id` parameter was added. |
| 1110 | * |
| 1111 | * @param mixed $pre_option The default value to return if the option does not exist. |
| 1112 | * @param string $option Option name. |
| 1113 | * @param int $network_id ID of the network. |
| 1114 | */ |
| 1115 | $pre = apply_filters( "pre_site_option_{$option}", false, $option, $network_id ); |
| 1116 | |
| 1117 | if ( false !== $pre ) { |
| 1118 | return $pre; |
| 1119 | } |
| 1120 | |
| 1121 | // prevent non-existent options from triggering multiple queries |
| 1122 | $notoptions_key = "$network_id:notoptions"; |
| 1123 | $notoptions = wp_cache_get( $notoptions_key, 'site-options' ); |
| 1124 | |