Cześć możecie mi proszę wytłumaczyć poniższy zapis

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$nDir = $direction == 'ASC' ? 'DESC' : 'ASC';
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Dzięki

To taki inny (skrócony) IF:

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if($direction == 'ASC') {
 $nDir = 'ASC';
} else {
  $nDir = 'DESC';
}
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Przenoszę.

a czy mogę tego użyć w akcji onClick ?
Już sobie odpowiedziałem i zrobiłem, dzięki za pomoc.
Problem polegał na literówce stąd moje pierwsze pytanie, bo nie chciało działać

A jak można skrócić poniższe

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        if ((isset($_SESSION[$page_action_href . '_orderby_direction']))) {
            if ($_SESSION[$page_action_href . '_orderby_direction'] == 'ASC') {
                $nDir = 'ASC';
            }
            else {
                $nDir = 'DESC';
            }
        }
        else {
            $nDir = 'ASC';
        }
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skrocona instrukcja warunkowa if

dzięki

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$nDir =  (isset($_SESSION[$page_action_href . '_orderby_direction'])) ? (($_SESSION[$page_action_href . '_orderby_direction'] == 'ASC') ? $nDir = 'ASC' : $nDir = 'DESC') : $nDir = 'ASC';
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Teraz działa jak ta lala

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<?php
 
echo "<content>";
    echo "<div id=\"overlay\"><div id=\"tux-loading-indicator\">";
        echo "</div></div>";
    echo "<div class=\"container\">";
        echo "<div class=\"center\">";        
            echo "<h2>Lista Dysków</h2>";
        echo "</div>";
 
        $page_action_href = 'hdd_list';
        $nDir =  (isset($_SESSION[$page_action_href . '_orderby_direction'])) ? (($_SESSION[$page_action_href . '_orderby_direction'] == 'DESC') ? $nDir = 'ASC' : $nDir = 'DESC') : $nDir = 'ASC';
        echo $modules->getPagination($hdd->get_hdd_count(), $page_action_href);
        $hdd_object = $hdd->get_hdd_list( $_SESSION[$page_action_href . '_limit'], ($_GET['page'] - 1) * $_SESSION[$page_action_href . '_limit'], isset($_SESSION[$page_action_href . '_orderby']) ? $_SESSION[$page_action_href . '_orderby'] : null, isset( $_SESSION[$page_action_href . '_orderby_direction'] ) ? $_SESSION[$page_action_href . '_orderby_direction'] : null );
        if ( $_GET['page'] > 1) { $k = ( $_SESSION[$page_action_href . '_limit'] ) * ( $_GET['page'] - 1 ) + 1; } else { $k = 1 ; }        
 
        echo "<div class=\"width_100 right\">";        
            echo "<span class=\"normal right width_50\">";
                echo "<span class=\"normal info_OK width_35 right\">Całkowita Pojemność: </span>";
                echo "<span class=\"huge user_data width_15 right\"> " . implode($hdd->count_hdd_capacity()) . " TB</span>" ;
            echo "</span>";
        echo "</div>";
        echo "<div class=\"width_100 right\">";        
            echo "<span class=\"normal right width_50\">";
                echo "<span class=\"normal info_OK width_35 right\">Pojemność Na Stronie: </span>";
 
 
                echo "<span class=\"huge user_data width_15 right\"> " . implode($hdd->count_hdd_capacity( $_SESSION[$page_action_href . '_limit'], ($_GET['page'] - 1) * $_SESSION[$page_action_href . '_limit'], isset($_SESSION[$page_action_href . '_orderby']) ? $_SESSION[$page_action_href . '_orderby'] : null , isset( $_SESSION[$page_action_href . '_orderby_direction'] ) ? $_SESSION[$page_action_href . '_orderby_direction'] : null )) . " TB</span>" ;
 
 
            echo "</span>";
 
 
        echo "</div>";
        echo "<div class=\"table-row name\">";
            echo "<div class=\"dvr_list\">#</div>";
            echo "<div class=\"dvr_list\" onClick=\"changeOrderBy( 'hdd_vendor', '$nDir', '$page_action_href' );\">Producent</div>";
            echo "<div class=\"dvr_list\" onClick=\"changeOrderBy( 'hdd_model_name', '$nDir', '$page_action_href' );\">Model</div>";
            echo "<div class=\"dvr_list\" onClick=\"changeOrderBy( 'hdd_sn', '$nDir', '$page_action_href' );\">Numer Seryjny</div>";
            echo "<div class=\"dvr_list\" onClick=\"changeOrderBy( 'hdd_capacity', '$nDir', '$page_action_href' );\">Pojemność</div>";
            echo "<div class=\"dvr_list\" onClick=\"changeOrderBy( 'hdd_status', '$nDir', '$page_action_href' );\">Status</div>";
            echo "<div class=\"dvr_list\" onClick=\"changeOrderBy( 'hdd_dvr_id', '$nDir', '$page_action_href' );\">Rejestrator</div>";
             echo "<div class=\"dvr_list\">Edit</div>";
        echo "</div>";                      
 
        foreach ($hdd_object as $hdd_object) {
            echo "<div class=\"table-row elements\">";
                echo "<div class=\"dvr_list\">" . $k++ . "</div>";
                echo "<div class=\"dvr_list\">" . $hdd_object['hdd_vendor'] . "</div>";
                echo "<div class=\"dvr_list\">" . $hdd_object['hdd_model_name'] . "</div>";
                echo "<div class=\"dvr_list\">" . $hdd_object['hdd_sn'] . "</div>";
                echo "<div class=\"dvr_list\">" . $hdd_object['hdd_capacity'] . " TB</div>";
                echo "<div class=\"dvr_list\">" . $hdd_object['hdd_status'] . "</div>";
                echo "<div class=\"dvr_list\">" . $hdd_object['hdd_dvr_id'] . "</div>";         
                echo "<div class=\"dvr_list icon\"><a href=\"../panel/index.php?action=hdd_edit_page&edit=" . $dvr->encrypt_decrypt_passwd('encrypt', $hdd_object['hdd_id']) . "_" . $dvr->encrypt_decrypt_passwd('encrypt', $hdd_object['hdd_sn']) . "\">";
                    include "" . $_SERVER['DOCUMENT_ROOT'] . "/images/icons/edit.svg"; 
                echo "</a></div>";        
            echo "</div>"; 
    }
        echo "</div>";    
    echo "</content>";  
?>
    <script src="../../js/logged_in_scripts.js"></script>
 
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