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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 |
|---|---|
| 282 | $this->meta_query->parse_query_vars( $this->query_vars ); |
| 283 | |
| 284 | /** |
| 285 | * Fires before comments are retrieved. |
| 286 | * |
| 287 | * @since 3.1.0 |
| 288 | * |
| 289 | * @param WP_Comment_Query &$this Current instance of WP_Comment_Query, passed by reference. |
| 290 | */ |
| 291 | do_action_ref_array( 'pre_get_comments', array( &$this ) ); |
| 292 | |
| 293 | // $args can be whatever, only use the args defined in defaults to compute the key |
| 294 | $key = md5( serialize( wp_array_slice_assoc( $this->query_vars, array_keys( $defaults ) ) ) ); |
| 295 | $last_changed = wp_cache_get( 'last_changed', 'comment' ); |
| 296 | if ( ! $last_changed ) { |
| 297 | $last_changed = microtime(); |
| 298 | wp_cache_set( 'last_changed', $last_changed, 'comment' ); |
| 299 | } |
| 300 | $cache_key = "get_comments:$key:$last_changed"; |