php - 根据变量包含不同的内容

Question

我正在使用此方法根据从上一页传递下来的变量显示不同的内容。

    <?php
    if (isset($_GET['click'])) {
        if($_GET['click'] == 'person'){
          file_put_contents('person.txt', ((int) file_get_contents('person.txt')) + 1);
          include 'resultperson.php';
        } elseif ($_GET['click'] == 'text'){
          file_put_contents('text.txt', ((int) file_get_contents('text.txt')) + 1);
          include 'resulttext.php';
        } elseif ($_GET['click'] == 'online'){
          file_put_contents('online.txt', ((int) file_get_contents('online.txt')) + 1);
          include 'resultonline.php';
        }
    } else {
        include 'resulttext.php';
    } 
    ?>  

问题是，当我点击刷新时，file_put_contents() 函数将再次执行。这只是我用来跟踪用户点击该按钮的次数的一种方式。

如何防止在刷新页面时注入(inject)整数的增量？

或者是否有更简单的方法来完成这一切？

Answer 1

使用 session 可能是最好的选择，除非您不介意当用户关闭浏览器并再次访问页面时它会被触发。

// This will be set to true if the user has the session variable set
$clicked = isset($_SESSION['clicked']);

// Check if get variable 'click' is set, and that $clicked is false. 
// If 'click is set and $clicked if false, the variable $click is set to the 
// value of $_GET['click'] (for example 'person'). Other wise it will be set to false.
$click = (isset($_GET['click']) && !$clicked) ? $_GET['click'] : false;   

// Set the session variable 'clicked' if it isn't set so that the next time 
// the user visits, we'll know
if (!$clicked) {
    $_SESSION['clicked'] = 1;
}

if($click == 'person'){
    file_put_contents('person.txt', ((int) file_get_contents('person.txt')) + 1);
    include 'resultperson.php';
} elseif ($click == 'text'){
    file_put_contents('text.txt', ((int) file_get_contents('text.txt')) + 1);
    include 'resulttext.php';
} elseif ($click == 'online'){
    file_put_contents('online.txt', ((int) file_get_contents('online.txt')) + 1);
    include 'resultonline.php';
} else {
    include 'resulttext.php';
}