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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 | 
|---|---|
| 1308 |  | 
| 1309 |      /** | 
| 1310 |       * Filters meta for a site on creation. | 
| 1311 |       * | 
| 1312 |       * @since 5.2.0 | 
| 1313 |       * | 
| 1314 |       * @param array $meta    Associative array of site meta keys and values to be inserted. | 
| 1315 |       * @param int   $site_id ID of site to populate. | 
| 1316 |       */ | 
| 1317 |      $site_meta = apply_filters( 'populate_site_meta', $meta, $site_id ); | 
| 1318 |  | 
| 1319 |      $insert = ''; | 
| 1320 |      foreach ( $site_meta as $meta_key => $meta_value ) { | 
| 1321 |           if ( is_array( $meta_value ) ) { | 
| 1322 |                $meta_value = serialize( $meta_value ); | 
| 1323 |           } | 
| 1324 |           if ( ! empty( $insert ) ) { | 
| 1325 |                $insert .= ', '; | 
| 1326 |           } |