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This redirects to 1since the header is sent as soon as the echo happens.
You also won't see any "headers already sent" errors because the browser follows the redirect before it can display the example is pretty good BUT in time you use "exit" the parser will still work to decide what's happening next the "exit" 's action should do ('cause if you check the manual exit works in others situations too).
Several times this one is asked on the net but an answer could not be found in the docs on ... If not, click here." you cannot use header( 'Location: ...' ) as you can't sent any output before the headers are sent.
If you want to redirect an user and tell him he will be redirected, e. So, either you have to use the HTML meta refresh thingy or you use the following: The HTTP status code changes the way browsers and robots handle redirects, so if you are using header(Location:) it's a good idea to set the status code at the same time.
There are a number of options that users may be able to set for their browser that change its default caching behavior.
By sending the headers above, you should override any settings that may otherwise cause the output of your script to be cached.
When using PHP to output an image, it won't be cached by the client so if you don't want them to download the image each time they reload the page, you will need to emulate part of the HTTP protocol.Additionally, Note: There is a bug in Microsoft Internet Explorer 4.01 that prevents this from working. There is also a bug in Microsoft Internet Explorer 5.5 that interferes with this, which can be resolved by upgrading to Service Pack 2 or later.I strongly recommend, that you use header($_SERVER["SERVER_PROTOCOL"]." 404 Not Found"); instead of header("HTTP/1.1 404 Not Found"); I had big troubles with an Apache/2.0.59 (Unix) answering in HTTP/1.0 while I (accidentially) added a "HTTP/1.1 200 Ok" - Header.Thanks Rasmus Lerdorf and his team to wrap off parts of unusual php functionality ,php 7 roolez!!!!! When the user clicks the link, I want them to get the uncompressed version of the file.