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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 |
|---|---|
| 3781 | else |
| 3782 | $per_page = 20; |
| 3783 | } |
| 3784 | |
| 3785 | if ( 'edit_comments_per_page' == $option ) |
| 3786 | $per_page = apply_filters( 'comments_per_page', $per_page, isset($_REQUEST['comment_status']) ? $_REQUEST['comment_status'] : 'all' ); |
| 3787 | elseif ( 'categories_per_page' == $option ) |
| 3788 | $per_page = apply_filters( 'edit_categories_per_page', $per_page ); |
| 3789 | else |
| 3790 | $per_page = apply_filters( $option, $per_page ); |
| 3791 | |
| 3792 | $return = "<div class='screen-options'>\n"; |
| 3793 | if ( !empty($per_page_label) ) |
| 3794 | $return .= "<input type='text' class='screen-per-page' name='wp_screen_options[value]' id='$option' maxlength='3' value='$per_page' /> <label for='$option'>$per_page_label</label>\n"; |
| 3795 | $return .= "<input type='submit' class='button' value='" . esc_attr__('Apply') . "' />"; |
| 3796 | $return .= "<input type='hidden' name='wp_screen_options[option]' value='" . esc_attr($option) . "' />"; |
| 3797 | $return .= "</div>\n"; |
| 3798 | return $return; |
| 3799 | } |