A lot of people (including me) experience problem accessing a cookie immediately after setting it. The thing is that you can’t access a cookie inside the same request that is used to set it. Meaning that if your script sets a cookie using setcookie(), you have to reload the page using header(“Location: anotherpage.php”) to process and read the cookie inside the script called anotherpage.php.
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I hope it’s clear now. If not, don’t hesitate to comment.