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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 |
---|---|
1897 | else |
1898 | $per_page = 20; |
1899 | } |
1900 |
|
1901 | if ( 'edit_comments_per_page' == $option ) |
1902 | $per_page = apply_filters( 'comments_per_page', $per_page, isset($_REQUEST['comment_status']) ? $_REQUEST['comment_status'] : 'all' ); |
1903 | elseif ( 'categories_per_page' == $option ) |
1904 | $per_page = apply_filters( 'edit_categories_per_page', $per_page ); |
1905 | else |
1906 | $per_page = apply_filters( $option, $per_page ); |
1907 |
|
1908 | // Back compat |
1909 | if ( isset( $screen->post_type ) ) |
1910 | $per_page = apply_filters( 'edit_posts_per_page', $per_page, $screen->post_type ); |
1911 |
|
1912 | $return = "<div class='screen-options'>\n"; |
1913 | if ( !empty($per_page_label) ) |
1914 | $return .= "<input type='text' class='screen-per-page' name='wp_screen_options[value]' id='$option' maxlength='3' value='$per_page' /> <label for='$option'>$per_page_label</label>\n"; |
1915 | $return .= get_submit_button( __( 'Apply' ), 'button', 'screen-options-apply', false ); |