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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 |
|---|---|
| 991 | |
| 992 | /** |
| 993 | * Filter meta for a network on creation. |
| 994 | * |
| 995 | * @since 3.7.0 |
| 996 | * |
| 997 | * @param array $sitemeta Associative array of network meta keys and values to be inserted. |
| 998 | * @param int $network_id ID of network to populate. |
| 999 | */ |
| 1000 | $sitemeta = apply_filters( 'populate_network_meta', $sitemeta, $network_id ); |
| 1001 | |
| 1002 | $insert = ''; |
| 1003 | foreach ( $sitemeta as $meta_key => $meta_value ) { |
| 1004 | if ( is_array( $meta_value ) ) |
| 1005 | $meta_value = serialize( $meta_value ); |
| 1006 | if ( !empty( $insert ) ) |
| 1007 | $insert .= ', '; |
| 1008 | $insert .= $wpdb->prepare( "( %d, %s, %s)", $network_id, $meta_key, $meta_value ); |
| 1009 | } |