Home Backend Development PHP Tutorial crontab执行不了php的解决办法

crontab执行不了php的解决办法

Jun 13, 2016 am 10:55 AM
cron crontab nbsp php redis

crontab执行不了php的解决方法
用crontab跑php程序时,如何去调试,各人有各人的方法。我也有套方法,看一下,我是如何解决crontab执行不了php程序这个问题的。
一,php文件有没有执行权限
[[email protected] cron]# ls -al |grep del 
-rwxr-xr-x  1 zwh  ftpgroup  494 10-20 16:42 del_redis.php 
如果没有X,说明没有执行权限,当然也执行不了。如果你不知道你登录的用户所在的组是不是有权限,直接给所有组都加上权限就行了。方法如下:
查看复制打印?
[[email protected] cron]# chmod +x ./del_redis.php 
二,如果有执行权限了,还是执行不了
解决方法如下:
1,在php程序里面写log(例如:error_log()这个函数),这也是必须的,因为crontab定时执行,要是没有log,你怎么知道程序执行的结果怎么样。这样我们可以通过log来查看crontab执行的情况。
2,也可以直接在crontab里面,将执行的结果输出一个文件当中。然后在这个文件当中查看执行情况。例如:
查看复制打印?
*/10 * * * * /usr/local/php/bin/php /var/www/cron/del_redis.php >> /home/zhangy/cron.txt

3,用crontab来执行php,是不走apache,nginx,所以$_SERVER,$_ENV这类变量根本用不了。所以检查一下php代码中有没有这类变量,如果有拿掉。

4,php的相对路径问题
因为有思维定势在做怪,这个问题也是最容易忽视的。
查看复制打印?
include_once'./mysql.php'; 
当php代码中,用的是相对路径时,只有进入到那个目录下执行/usr/local/php/bin/php /var/www/cron/level_rank.php才能生效。这个问题我遇到过至少二次,但是再遇到时还是想不起来。
解决方法如下:
查看复制打印?
*/10 * * * * cd /var/www/cron && /usr/local/php/bin/php /var/www/cron/level_rank.php 
或者
在php代码中用绝对路径


详细见
http://blog.51yip.com/php/1346.html

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