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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 |
|---|---|
| 235 | $this->parse_query(); |
| 236 | |
| 237 | /** |
| 238 | * Fires before sites are retrieved. |
| 239 | * |
| 240 | * @since 4.6.0 |
| 241 | * |
| 242 | * @param WP_Site_Query &$this Current instance of WP_Site_Query, passed by reference. |
| 243 | */ |
| 244 | do_action_ref_array( 'pre_get_sites', array( &$this ) ); |
| 245 | |
| 246 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
| 247 | $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) ); |
| 248 | $last_changed = wp_cache_get_last_changed( 'sites' ); |
| 249 | |
| 250 | $cache_key = "get_sites:$key:$last_changed"; |
| 251 | $cache_value = wp_cache_get( $cache_key, 'sites' ); |
| 252 | |
| 253 | if ( false === $cache_value ) { |