问题
root@xx:/var/www/test# which php
/usr/bin/php
root@xx:/var/www/test# ls -la
total 16
drwxrwxrwx 2 root root 4096 Nov 14 09:37 .
drwxrwxrwx 6 root root 4096 Nov 13 15:51 ..
-rwxrwxrwx 1 root root 153 Nov 14 09:35 test.php
This is my test.php file:
<?php
$my_file = 'file.txt';
$handle = fopen($my_file, 'w') or die('Cannot open file: '.$my_file); //implicitly creates file
And this is the output of crontab -l:
#this is ok
* * * * * touch /tmp/hello
#this only creates an empty php_result.log
* * * * * /usr/bin/php /var/www/test/test.php > /tmp/php_result.log
root@xx:/var/www/test# php -v
PHP 5.4.34-0+deb7u1 (cli) (built: Oct 20 2014 08:50:30)
The cron job will not run, and the problem is with php. If i run the file manually, all works well.
php test.php
Related question: Why is crontab not executing my PHP script?.
回答1:
You need to use full paths in your scripts. Otherwise, cron won't know where is that file.
so instead of
$my_file = 'file.txt';
use
$my_file = '/path/to/file.txt';
Probably you were getting file.txt stored somewhere in /.
Note crontab runs in a limited environment, so it cannot assume anything regarding to paths. That's why you also have to provide the full path of php, etc.
From Troubleshooting common issues with cron jobs:
Using relative paths. If your cron job is executing a script of some kind, you must be sure to use only absolute paths inside that script. For example, if your script is located at /path/to/script.phpand you're trying to open a file called file.php in the same directory, you cannot use a relative path such as fopen(file.php). The file must be called from its absolute path, like this: fopen(/path/to/file.php). This is because cron jobs do not necessarily run from the directory in which the script is located, so all paths must be called specifically.
来源：https://stackoverflow.com/questions/26927144/php-cron-job-not-running