php - session_id() always returns '' even if a session cookie is set -

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I am currently experiencing problems with PHP function session_id.

At the beginning of my scripts, I check that the user has a session and I do not want to call session_start () because it generates a session cookie.

Every time I call session_id, this gives "it, even though the session is definitely set." I've verified that a session is set by checking session cookies through the $ _COOKIE array. Session_start () session is not present for PHP without calling Session_start () after you can easily call

Check that the user has found a session with the key check in the $ _SESSION super-global array.

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