need php help

Msg # 18 of 82 on Fidonet Linux User Echo
Time: Tuesday, 11-12-19, 7:50
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 On 2019 Nov 12 03:58:20, you wrote to All:
  AA> I type it in at the root site address:
  AA>    http:// /what-time-changed-php.php
  AA>  ..but this is coming up with a blank display.
  AA> What am I doing wrong?
 ml> invalid or no html? have you looked at the resulting page's
 ml> source in your browser?
php can be executed directly.  I don't need to call it within html.
Meanwhile, after adjusting the script without the "if.." and thus forcing
an output, I would get, the output:
 Last modified: December 31 1969 19:00:00.
 ..which is php-speak for "file not found".
 ml> also, for security reasons, you'd be better off to have
 ml> $filename contain only the file's name... put the path in
 ml> another one and do not output it at all... then connect the two
 ml> when needed...
What do you mean "do not output it at all"?  How would I see the result
I just want to produce a report of "last modified" dates of files in
specific directories. And if that works, have the script email the output
on a schedule. But the above is a first step.
How would this would be a security risk?
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