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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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408 | } |
409 |
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410 | $sql_exclude_cats = ''; |
411 | if ( !empty($excluded_categories) ) { |
412 | $blah = explode(' and ', $excluded_categories); |
413 | $posts_in_ex_cats = get_objects_in_term($blah, 'category'); |
414 | $posts_in_ex_cats_sql = 'AND p.ID NOT IN (' . implode($posts_in_ex_cats, ',') . ')'; |
415 | } |
416 |
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417 | $join = apply_filters( 'get_next_post_join', $join, $in_same_cat, $excluded_categories ); |
418 | $where = apply_filters( 'get_next_post_where', "WHERE p.post_date > '$current_post_date' AND p.post_type = 'post' AND p.post_status = 'publish' $posts_in_ex_cats_sql AND p.ID != $post->ID", $in_same_cat, $excluded_categories ); |
419 | $sort = apply_filters( 'get_next_post_sort', 'ORDER BY p.post_date ASC LIMIT 1' ); |
420 |
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421 | return @$wpdb->get_row("SELECT p.ID, p.post_title FROM $wpdb->posts AS p $join $where $sort"); |
422 | } |
423 |
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424 |
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425 | function previous_post_link($format='« %link', $link='%title', $in_same_cat = false, $excluded_categories = '') { |
426 |
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