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Redirect PHP script in pages & types of redirect

Redirecting a visitor or the browser is required in different situations. If a a page is temporarely down then we can use HTTP 302 redirect. Same way permanent redirection is HTTP 301 redirection. All the 3xx are different types of redirection and out of them 301 and 302 are common. HTTP 301 permanent redirection is well accepted by search engines also. We will discuss PHP and JavaScript redirection methods here.

We will be using Location Header function to redirect a page. This script works when we have not send any php or html command to out put any thing in the browser. Care is to be taken not to send any other thing to the browser after the header redirection using location command. Here is the code.
header ("Location: http://www.starjokes.com"); 
/* Redirect browser to starjokes.com  web site */
exit; // Closes further script execution 
You can see this code above will redirect the page to a new url.

Now we will write the code for 301 redirection (page permanently moved )
header("HTTP/1.1 301 Moved Permanently");
header ("Location: http://www.allkm.com/km-basics/data.php");
exit;
If we send any html tag or any other data to the browser before the redirection command, then we will get an error message like this
Warning: Cannot modify header information - 
headers already sent by (output started at L:\php_files\t\test6.php:13) in L:\php_files\t\test6.php on line 14
By using JavaScript also the redirection can be done. Here is the code printing the javascript code for the browser to redirect. But this will work if JavaScript is enabled in the browser.
print "<script>";
print " self.location='mynewpage.html';"; print "</script>";
You can read about Meta Redirect here

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