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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 |
|---|---|
| 439 | if ( apply_filters('akismet_optimize_table', ($n == 11)) ) // lucky number |
| 440 | $wpdb->query("OPTIMIZE TABLE $wpdb->comments"); |
| 441 | |
| 442 | } |
| 443 | |
| 444 | function akismet_delete_old_metadata() { |
| 445 | global $wpdb; |
| 446 | |
| 447 | $now_gmt = current_time( 'mysql', 1 ); |
| 448 | $interval = apply_filters( 'akismet_delete_commentmeta_interval', 15 ); |
| 449 | |
| 450 | # enfore a minimum of 1 day |
| 451 | $interval = absint( $interval ); |
| 452 | if ( $interval < 1 ) { |
| 453 | return; |
| 454 | } |
| 455 | |
| 456 | // akismet_as_submitted meta values are large, so expire them |
| 457 | // after $interval days regardless of the comment status |