php - PHP Call a function from a hyperlink

Question

I have a list of file download urls that will be displayed to user and upon user clicking it will trigger download. I am using the following code:

echo "<a href=$val1 download=\"$fileId.$fileformat\".>Click Here To Download</a>";

But how do I change this so that a function is called instead of download as I need to do some processing before download. I used the following but it is not working:

echo "<a href=$val1 onclick=func($val1,$fileId,$fileformat)>Click Here To Download</a>";

Is there any other way to call a function from hyperlink?

I tried using if(isset($_GET['id'])) way but I have a list of links which I need to display to user and when user clicks one than pass to function to trigger download.

score 2 · Accepted Answer

您不能直接从 html 调用 php 函数。

您的问题的解决方案是调用一个 php 文件，该文件将运行该函数并返回文件以供下载

前任。

<a href="download-file.php?val1=$val1&fileId=$fileId&fileFormat=$fileFormat">Click Here To Download</a>

您的 donwload-file.php 文件检查并验证 $_GET 并且您将运行返回结果所需的函数。

score 0 · Accepted Answer

启动 php 函数“onclick”的唯一方法是使用 $_GET[]。

您有两种方法可以做到这一点：

你href一个变量，例如。触发。

<a href="?variable=value">click</a>
<?php
if(isset($_GET['variable'])) {
   $variable = $_GET['variable'];

   /* now you can either directly execute your
      function, create a switch or an if/elseif block */

   switch($variable) {
      case "file1":
         function myFunction() {
         /* your function */
         }
      break 1;
   }
}
?>

您创建一个类（OOP）并将其包含在您的文件中：

<?php
$trigger = $_GET['trigger'];
include "include_path/class_name.php";
?>

班级：

    <?php
    class ClassName {

      function ClassName() {
      global $trigger;

        if($trigger == "value1") {
        // your function
        }

        if($trigger == "value2") {
        $this->myFunction();
        }

        if($trigger == "value3") {
        $otherClassName->myOtherFunction();
        }

      }

    }
    ?>

score 0 · Accepted Answer

尝试这个，

echo "<a href='javascript:;' onclick=func('".$val1."','".$fileId."','".$fileformat."')>
   Click Here To Download</a>";

score 0 · Accepted Answer

$("#link_id").click(function() {
//Your code here
});


echo "<a href=$val1 download=\"$fileId.$fileformat\". id='link_id'>Click Here To Download</a>";

php - PHP Call a function from a hyperlink

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