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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 |
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242 | $this->parse_query(); |
243 |
|
244 | /** |
245 | * Fires before sites are retrieved. |
246 | * |
247 | * @since 4.6.0 |
248 | * |
249 | * @param WP_Site_Query &$this Current instance of WP_Site_Query, passed by reference. |
250 | */ |
251 | do_action_ref_array( 'pre_get_sites', array( &$this ) ); |
252 |
|
253 | // $args can include anything. Only use the args defined in the query_var_defaults to compute the key. |
254 | $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $this->query_var_defaults ) ) ) ); |
255 | $last_changed = wp_cache_get_last_changed( 'sites' ); |
256 |
|
257 | $cache_key = "get_sites:$key:$last_changed"; |
258 | $cache_value = wp_cache_get( $cache_key, 'sites' ); |
259 |
|
260 | if ( false === $cache_value ) { |