用于提交由PHP处理的表单的JS / jQuery示例

I have PHP code like this: (for signing out - located in a php page together with other php handlers for different functions and this file is included in pages like index.php or other relevant pages.)

if(isset($_POST['signout'])) { // logout button
  // Clear and destroy sessions and redirect user to home page url.
  $_SESSION = array();
  session_destroy();
  // redirect to homepage (eg: localhost)
  header('Location: http://localhost/index.php');
  }

I normally use a <form action="index.php" method="post"> where the function is currently included and <input type="submit" name="signout"> for such things but this time i would like to use an anchor tag like: <a href="" >Sign Out</a> for signing out.

Would anyone be kind enough to show an example code that will trigger a submit that will be handled by the given PHP code above.

Either a jQuery or Javascript solution would do. I would just like to see a complete example on how this works.

There's good reason for using a POST for submitting authentication tokens which usually commences or alters the session state - but these don't really apply to the problem of closing the session - why not just just trigger this via a GET?

But if you really must do a POST, and you really must do it via a a href (rather than styling a submit button) and you really must do it via javascript (which will break if the client has javascript disabled) then...

<script>
function sendForm(formId) 
{
   if (document.getElementById(formId).onsubmit()) 
      document.getElementById(formId).submit();
}
<script>
<form id='logout'>
<input type='hidden' name='signout' value='1'>
</form>
<a href="javascript:sendForm('logout');">logout</a>