How can open_basedir restrictions impact file uploads in PHP?

Open_basedir restrictions can impact file uploads in PHP by limiting the directories from which files can be uploaded. If the upload directory is outside the allowed directories specified in open_basedir, the file upload will fail. To solve this issue, you can set the upload_tmp_dir directive in your php.ini file to a directory within the open_basedir restrictions.

// Set the upload_tmp_dir directive in php.ini to a directory within open_basedir restrictions
ini_set('upload_tmp_dir', '/path/to/upload/directory');