PHP file_put_contents() 的奇怪问题

Question

Using PHP v5.6.40 under Ubuntu 18.04.04 (through php5.6 apache mod), this is the line of code:

file_put_contents('/tmp/deploy.hook.log', date('Y-m-d H:i:s') . ': ' . $data . "\n", FILE_APPEND);

It works in every other server / environment I have set but not here for some reason, no PHP errors or permission issues; the function also returns the number of bytes written even though the file remains empty.

Other interesting thing is that if I run the code using the php cli as www-data it works fine.

Any thoughts?

Answer 1

看来 Sammitch 的评论是正确的，我真正的 /tmp 目录类似于 /tmp/systemd-private-{some-hash}