用PHP无法获得表单值

Question

I am trying to get the value of a form (text field) with _POST, and store it to a text file but it doesn't work. Here's my code:

HTML

<form>
<input type="text" name="test" id="test" value="">
<input type="button" onclick="location.href='example.com/index.php?address=true';" value="ODOSLAŤ" />
</form>

PHP

if (isset($_GET['address'])) {

    $email = $_POST['test'];

    $myfile = fopen("log.txt","a") or die("Error.");
    fwrite($myfile, "
".$email);

    // this prints nothing
    echo $email;  
  }

I can't get the value of that text field. Nor GET nor POST doesn't work for me. What am I doing wrong?

Answer 1

You are missing a post method in your form.

<form method="post" action="example.com/index.php?address=true">
     <input type="text" name="test" id="test" value="">
     <input type="submit" value="ODOSLAŤ" />
</form>

You also have to change the following line.

if (isset($_GET['address'])) {

With

if (isset($_POST['address'])) {

You want to post after triggering an action as FreedomPride mentioned

Conclusion

You want to declare for example a post methodif you know that you would like to post that data in the future.

As FreedomPride also mentioned :

You are using a GET, but if a user does not input anything your script won't work, there by it is recommended to use a POST