What are some common reasons for a PHP script running on localhost but not on a web server, specifically regarding session variables?

One common reason for a PHP script running on localhost but not on a web server is due to differences in server configurations, specifically related to session variables. This can be caused by session.save_path not being properly set or session.auto_start being enabled on the web server. To solve this issue, ensure that the session.save_path is writable and session.auto_start is disabled on the web server. 

// Set session save path
session_save_path('/path/to/writable/directory');

// Disable session auto start
ini_set('session.auto_start', 0);

// Start session
session_start();

Keywords

localhost web server PHP script session variables error types

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