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Redirecting to a Different Location in PHP
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Redirecting to a Different Location in PHP

InfinityCoder November 26, 2016

You want to automatically send a user to a new URL. For example, after successfully saving form data, you want to redirect a user to a page that confirms that the data has  been saved.

Before any output is printed, use header() to send a Location header with the new URL, and then call exit() so that nothing else is printed:

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header('Location: http://www.example.com/confirm.html');
exit();

To pass variables to the new page, include them in the query string of the URL, as in Example 8-11.
Example 8-11. Redirecting with query string variables

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header('Location: http://www.example.com/?monkey=turtle');
exit();

Redirect URLs must include the protocol and hostname.

Example 8-12. Good and bad Location headers

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// Good Redirect
header('Location: http://www.example.com/catalog/food/pemmican.php');
 
// Bad Redirect
header('Location: /catalog/food/pemmican.php');

The URL that you are redirecting a user to is retrieved with GET. You can’t redirect someone to retrieve a URL via POST.

With JavaScript, however, you can simulate a redirect via POST by generating a form that gets submitted (via POST) automatically. When a (JavaScript-enabled) browser receives the page in Example 8-13, it will immediately
POST the form that is included.
Example 8-13. Redirecting via a posted form

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<html>
<body onload="document.getElementById('redirectForm').submit()">
  <form id='redirectForm' method='POST' action='/done.html'>
   <input type='hidden' name='status' value='complete'/>
   <input type='hidden' name='id' value='0u812'/>
   <input type='submit' value='Please Click Here To Continue'/>
  </form>
</body>
</html>

The form in Example 8-13 has an id of redirectForm, so the code in the <body/> element’s onload attribute submits the form.

The onload action does not execute if the browser has JavaScript disabled. In that situation, the user sees a Please Click Here To Continue button.

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