Clean up PHP session files

problem ：

On my website I use PHP sessions. On my website , I use PHP conversation .Session information is stored in files in my ./session path. Session information is stored in my ./session In the file in the path .After a few months I discovered that these session files are never deleted, by now there are 145.000 of them in this directory. After a few months , I found that these session files were never deleted , up to now , There are in this directory 145.000 File .

How should these be cleaned up? How should these be cleaned up ？Do I have to do it programmatically, or is ther a setting I can use somewhere that would have this cleanup happen automatically? Do I have to do this programmatically , Or the settings I can use where this cleanup can be done automatically ？

EDIT forgot to mention: This site runs at a provider, so I don't have access to a command line. edit Forgot to mention ： The site runs on the provider , So I have no access to the command line .I do have ftp-access, but the session files belong to another user (the one the webserver proces runs I guess) From the first answers I got I think it's not just a setting on the server or PHP, so I guess I'll have to implement something for it in PHP, and call that periodically from a browser (maybe from a cron job running on my own machine at home) I do ftp Access right , But the session file belongs to another user （ I guess this server is running this server ）. From the first answer I got , I think it's not just servers or PHP Settings on , So I think it must be in PHP To realize some functions , And call this function regularly from the browser （ Maybe it's running on my own home computer cron Homework ）

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Solution ：

Reference resources ： https://stackoom.com/en/question/2kDO