Problems with setting up multi-level directory sessions in PHP_PHP Tutorial

Find session.save_path in php.ini and set the value to session.save_path = '3;/tmp/session'; to enable the third-level directory to save the session. However, php will not automatically generate the directory structure. In this case, you can use mod_files.sh in the ext/session directory of the source code package to generate the directory

$ bash mod_files.sh /tmp/session 3

Generate After completing it, I found that the session still could not be generated. After struggling for a long time, I opened mod_files.bat and discovered the mystery. It turns out that I need to bring a parameter later, which corresponds to session.hash_bits_per_character in php.ini. This value defaults to 4, for development and production versions. The default configuration is 5, so use the following command to regenerate the directory

$ bash mod_files.sh /tmp/session 3 5

Finally you can log in.