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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 |
|---|---|
| 428 | } |
| 429 | |
| 430 | // Prepared as strings since comment_id is an unsigned BIGINT, and using %d will constrain the value to the maximum signed BIGINT. |
| 431 | $format_string = implode( ", ", array_fill( 0, count( $comment_ids ), '%s' ) ); |
| 432 | |
| 433 | $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->comments} WHERE comment_id IN ( " . $format_string . " )", $comment_ids ) ); |
| 434 | $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->commentmeta} WHERE comment_id IN ( " . $format_string . " )", $comment_ids ) ); |
| 435 | |
| 436 | foreach ( $comment_ids as $comment_id ) { |
| 437 | do_action( 'deleted_comment', $comment_id, $comments[ $comment_id ] ); |
| 438 | unset( $comments[ $comment_id ] ); |
| 439 | } |
| 440 | |
| 441 | clean_comment_cache( $comment_ids ); |
| 442 | do_action( 'akismet_delete_comment_batch', count( $comment_ids ) ); |
| 443 | } |
| 444 | |
| 445 | if ( apply_filters( 'akismet_optimize_table', ( mt_rand(1, 5000) == 11), $wpdb->comments ) ) // lucky number |
| 446 | $wpdb->query("OPTIMIZE TABLE {$wpdb->comments}"); |