What does the PHP open basedir restriction in effect error mean?

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What does the PHP error open basedir restriction in effect mean?

This error indicates that you are moving up 2 directories from your root directory, which is not allowed.

1. If you are on a Linux server, use the following absolute path: /var/www/domainname/htdocs

2. if you are on a Windows IIS server, you must use the following absolute path: d:\www/yourdomain.exthtdocs/yourrereprtory/your file