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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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1987 |
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1988 | /** |
1989 | * Filters the SQL JOIN clause for retrieving archives. |
1990 | * |
1991 | * @since 2.2.0 |
1992 | * |
1993 | * @param string $sql_join Portion of SQL query containing JOIN clause. |
1994 | * @param array $parsed_args An array of default arguments. |
1995 | */ |
1996 | $join = apply_filters( 'getarchives_join', '', $parsed_args ); |
1997 |
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1998 | $output = ''; |
1999 |
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2000 | $last_changed = wp_cache_get_last_changed( 'posts' ); |
2001 |
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2002 | $limit = $parsed_args['limit']; |
2003 |
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2004 | if ( 'monthly' === $parsed_args['type'] ) { |
2005 | $query = "SELECT YEAR(post_date) AS `year`, MONTH(post_date) AS `month`, count(ID) as posts FROM $wpdb->posts $join $where GROUP BY YEAR(post_date), MONTH(post_date) ORDER BY post_date $order $limit"; |