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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 |
|---|---|
| 1063 | * |
| 1064 | * @param string $domain The domain to be checked. |
| 1065 | * @param string $path The path to be checked. |
| 1066 | * @param int $site_id Optional. Relevant only on multi-network installs. |
| 1067 | * @return int |
| 1068 | */ |
| 1069 | function domain_exists($domain, $path, $site_id = 1) { |
| 1070 | global $wpdb; |
| 1071 | $result = $wpdb->get_var( $wpdb->prepare("SELECT blog_id FROM $wpdb->blogs WHERE domain = %s AND path = %s AND site_id = %d", $domain, $path, $site_id) ); |
| 1072 | return apply_filters( 'domain_exists', $result, $domain, $path, $site_id ); |
| 1073 | } |
| 1074 | |
| 1075 | /** |
| 1076 | * Store basic site info in the blogs table. |
| 1077 | * |
| 1078 | * This function creates a row in the wp_blogs table and returns |
| 1079 | * the new blog's ID. It is the first step in creating a new blog. |
| 1080 | * |
| 1081 | * @since MU |