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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 |
|---|---|
| 3723 | $per_page = 999; |
| 3724 | else |
| 3725 | $per_page = 20; |
| 3726 | } |
| 3727 | if ( 'edit_comments_per_page' == $option ) |
| 3728 | $per_page = apply_filters( 'comments_per_page', $per_page, isset($_REQUEST['comment_status']) ? $_REQUEST['comment_status'] : 'all' ); |
| 3729 | elseif ( 'categories' == $option ) |
| 3730 | $per_page = apply_filters( 'edit_categories_per_page', $per_page ); |
| 3731 | else |
| 3732 | $per_page = apply_filters( $option, $per_page ); |
| 3733 | |
| 3734 | $return = '<h5>' . __('Options') . "</h5>\n"; |
| 3735 | $return .= "<div class='screen-options'>\n"; |
| 3736 | if ( !empty($per_page_label) ) |
| 3737 | $return .= "<label for='$option'>$per_page_label</label> <input type='text' class='screen-per-page' name='wp_screen_options[value]' id='$option' maxlength='3' value='$per_page' />\n"; |
| 3738 | $return .= "<input type='submit' class='button' value='" . esc_attr__('Apply') . "' />"; |
| 3739 | $return .= "<input type='hidden' name='wp_screen_options[option]' value='" . esc_attr($option) . "' />"; |
| 3740 | $return .= "</div>\n"; |
| 3741 | return $return; |