Question

我有一点问题，我看不到解决方案。应该很容易。我想制作一个做类似事情的liitle脚本。当我点击：

类 - ＆gt;转到classes.php？sort = class-desc

然后再次上课 - ＆gt;转到classes.php？sort = class-asc

然后再次上课 - ＆gt;转到classes.php？sort = class-desc

等等......

if (isset($_GET['sort'])) {
        $item = $_GET['sort'];

        $pos = strpos($item, '-');
        $crit = substr($item, 0, $pos);
        $ordine = substr($item, $pos+1);
                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=class-asc>Class</a></div>";
                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=avg_grades-asc>General</a></div>";
                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=abscences-asc>Nr Abscences</a></div>";
                echo "<div style='float:left;width: 180px;'><a href=classes.php?sort=nr_students-asc>Nr Students</a></div><br><br>";


            }else{        

                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=class-desc>Class</a></div>";
                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=avg_grades-desc>General</a></div>";
                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=absente-desc>Nr Abscences</a></div>";
                echo "<div style='float:left;width: 180px;'><a href=classes.php?sort=nr_students-desc>Nr Students</a></div><br><br>";
            $item = 'avg_grades';                
        }

对不起，我知道这很简单，但我根本不知道把循环放在哪里。

谢谢

Answer 1

您需要另一个if else语句来检查$ordine变量：

if (isset($_GET['sort'])) {
    $item = $_GET['sort'];

    $sort = explode('-', $item);

    $crit = $sort[0];
    $ordine = $sort[1];

    if ($ordine === 'desc') {
        echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=class-asc>Class</a></div>";
        echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=avg_grades-asc>General</a></div>";
        echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=abscences-asc>Nr Abscences</a></div>";
        echo "<div style='float:left; width: 180px;'><a href=classes.php?sort=nr_students-asc>Nr Students</a></div><br><br>";
    } else {
        echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=class-desc>Class</a></div>";
        echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=avg_grades-desc>General</a></div>";
        echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=absente-desc>Nr Abscences</a></div>";
        echo "<div style='float:left; width: 180px;'><a href=classes.php?sort=nr_students-desc>Nr Students</a></div><br><br>";
        $item = 'avg_grades';
    }
}

或者您可以通过在$ordine代码a中应用href变量来缩短时间：

if (isset($_GET['sort'])) {
    $item = $_GET['sort'];

    $sort = explode('-', $item);

    $crit = $sort[0];
    $ordine = $sort[1] === 'desc' ? 'asc' : 'desc';

    echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=class-$ordine>Class</a></div>";
    echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=avg_grades-$ordine>General</a></div>";
    echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=absente-$ordine>Nr Abscences</a></div>";
    echo "<div style='float:left; width: 180px;'><a href=classes.php?sort=nr_students-$ordine>Nr Students</a></div><br><br>";
}

Answer 2

试试这段代码，我删除了代码重复：

if (isset($_GET['sort'])) {
        $item = $_GET['sort'];
        $submitted_direction_exploded = explode('-',$item);
        $submitted_direction = isset($submitted_direction_exploded[1]) ? $submitted_direction_exploded[1] : '';  
        $direction = ($direction=='desc')?'asc' : $submitted_direction;  
                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=class-$direction>Class</a></div>";
                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=avg_grades-$direction>General</a></div>";
                echo "<div style='float:left; width: 150px;'><a href=classes.php?sort=abscences-$direction>Nr Abscences</a></div>";
                echo "<div style='float:left;width: 180px;'><a href=classes.php?sort=nr_students-$direction>Nr Students</a></div><br><br>";

}

循环PHP Url GET

2 个答案: