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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 |
|---|---|
| 2131 | * @since 2.9.0 As 'pre_add_site_option_' . $key |
| 2132 | * @since 3.0.0 |
| 2133 | * @since 4.4.0 The `$option` parameter was added. |
| 2134 | * @since 4.7.0 The `$network_id` parameter was added. |
| 2135 | * |
| 2136 | * @param mixed $value Value of network option. |
| 2137 | * @param string $option Option name. |
| 2138 | * @param int $network_id ID of the network. |
| 2139 | */ |
| 2140 | $value = apply_filters( "pre_add_site_option_{$option}", $value, $option, $network_id ); |
| 2141 | |
| 2142 | $notoptions_key = "$network_id:notoptions"; |
| 2143 | |
| 2144 | if ( ! is_multisite() ) { |
| 2145 | $result = add_option( $option, $value, '', false ); |
| 2146 | } else { |
| 2147 | $cache_key = "$network_id:$option"; |
| 2148 | |
| 2149 | /* |