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<?php header('X-foo: bar'); session_id('foobar'); var_dump(session_id()); session_write_close(); session_start(); session_id(''); var_dump(session_id()); ?>
Output for git.master, git.master_jit, rfc.property-hooks
string(6) "foobar" Warning: session_start(): Session cannot be started after headers have already been sent in /in/9GTWE on line 6 Warning: session_id(): Session ID cannot be changed after headers have already been sent in /in/9GTWE on line 7 string(6) "foobar"

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