下文来为各位介绍PHP设置session定期自动清理的例子了，因为session默认是15分钟自动把变量给清除内存了，但有一些时间并不生效了，下面我们就来看看．
配置完成php后，默认php会将session生成到/tmp目录下，导致/tmp目录文件很多，因此需要对session进行定期的清理：
修改php.ini：
[root@hz scripts]# grep "session.save_path = " /usr/local/php/lib/php.ini
; session.save_path = "N;/path"
; session.save_path = "N;MODE;/path"
;session.save_path = "/tmp"
session.save_path = "2;/tmp/session"
[root@hz ~]# cat /byrd/script/Cleartmpsen.sh
#!/bin/bash
# Version:1.0
# Author:Byrd
# Site:www.t4x.org
# Contact:root#t4x.org
# This is script will clear php session before 3 hours.
i="0 1 2 3 4 5 6 7 8 9 a b c d e f"
for byrd in $i;
do
for x in $i;
do
mkdir -p /tmp/session/$byrd/$x;
done;
done
chown -R bywww:bywww /tmp/session
chmod -R 1777 /tmp/session
find /tmp/session -amin +180 -exec rm -rf {} ＼;
if [ `grep 'session.save_path =' /usr/local/php/lib/php.ini | wc -l` -eq 3 ];then
sed -i 's#;session.save_path = "/tmp"#;session.save_path = "/tmp"＼nsession.save_path = "2;/tmp/session"#g' /usr/local/php/lib/php.ini
else
exit 1
fi
定时任务：
[root@hz scripts]# echo '#This is a config php session BY:BYRD AT:2014-03-31' >>/var/spool/cron/root
[root@hz scripts]# echo '0 3 * * 0 /bin/bash /byrd/scripts/spehspsion.sh >/dev/null 2>&1' >>/var/spool/cron/root
备注：因为此配置修改了php.ini因此需要重新启动php进程。