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when I uploaded the script to the server I got this error
Warning: Unknown: open(/tmp/sess_58f54ee6a828f04116c2ed97664497b2, O_RDWR) failed: Permission denied (13) in Unknown on line 0 Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/tmp) in Unknown on line 0 The error appeared when I call session_start(), although I set the permission of /tmp folder to 777.
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session_start() creates a session or resumes the current one based on a session identifier passed via a GET or POST request, or passed via a cookie. When session_start() is called or when a session auto starts, PHP will call the open and read session save handlers.
Note: The session_start() function must be the very first thing in your document. Before any HTML tags. As for your question you can start session wherever you want, but beware that session must be started before any output.
It must be on every page you intend to use. The variables contained in the session—such as username and favorite color—are set with $_SESSION, a global variable. In this example, the session_start function is positioned after a non-printing comment but before any HTML.
Start a PHP Session A session is started with the session_start() function. Session variables are set with the PHP global variable: $_SESSION.
Change session path where you can write data or contact server administrator about /tmp problem
http://php.net/manual/en/function.session-save-path.php
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you will need to change your session.save_path php.ini directive
You can do that using session_save_path
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