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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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331 | $delete_interval = max( 1, intval( $delete_interval ) ); |
332 |
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333 | while ( $comment_ids = $wpdb->get_col( $wpdb->prepare( "SELECT comment_id FROM {$wpdb->comments} WHERE DATE_SUB(NOW(), INTERVAL %d DAY) > comment_date_gmt AND comment_approved = 'spam' LIMIT %d", $delete_interval, $delete_limit ) ) ) { |
334 | if ( empty( $comment_ids ) ) |
335 | return; |
336 |
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337 | $wpdb->queries = array(); |
338 |
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339 | foreach ( $comment_ids as $comment_id ) { |
340 | do_action( 'delete_comment', $comment_id ); |
341 | } |
342 |
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343 | // Prepared as strings since comment_id is an unsigned BIGINT, and using %d will constrain the value to the maximum signed BIGINT. |
344 | $format_string = implode( ", ", array_fill( 0, count( $comment_ids ), '%s' ) ); |
345 |
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346 | $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->comments} WHERE comment_id IN ( " . $format_string . " )", $comment_ids ) ); |
347 | $wpdb->query( $wpdb->prepare( "DELETE FROM {$wpdb->commentmeta} WHERE comment_id IN ( " . $format_string . " )", $comment_ids ) ); |
348 |
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349 | clean_comment_cache( $comment_ids ); |