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Re: Nested PHP [message #184872 is a reply to message #184866]

Wed, 12 February 2014 12:14

Stefan+Usenet
Messages: 3
Registered: June 2013

Karma:

Junior Member

On Wed, 12 Feb 2014 11:13:04 Adrian Tuddenham wrote:
>>>> > Might be worth trying writing to a temporary file, include()ing
>>>> > it, then cleaning up at the end of the script. It's a LITTLE
>>>> > complicated, but...

>>>> And subject to all kinds of problems - such as concurrency with
>>>> others requesting the same page, getting rid of old copies, having
>>>> to redirect the browser to the temporary file, the user bookmarking
>>>> the temporary file... and probably several others.

> How do you delete the file? I have tried a few 'obvious' (obvious to
> me, that is) methods, but they don't seem to work. I initially tried
> going down the temporary file route, but my inability to find a way of
> deleting the files was one reason why I abandoned it.

If you do something like:

-----------------------------------------
<?php

$file = tempnam('/tmp/', 'tmp');
$handle = fopen($file, 'w');
fwrite(
$handle,
'<html><body><p><?php echo "hello world"; ?></p></body></html>'
);
fclose($handle);

include $file;

unlink($file);

?>
-----------------------------------------

....then this is quite safe (one could create a race condition by
guessing the temporary filename and opening it in another process,
but this cannot be done from the outside and is thus IMHO rather
neglectible) and does what it should do.

But:

>>> The big question, though, is why can't this be solved WITHOUT the
>>> clunky mechanism. It almost smells richard-ish...

That's the point. Even though the code above works, it is ugly and
very difficult to maintain. I would use it as a base for fun programs
and brainteasers ("read in the current program file, modify it, write
it out with a different name and include it" comes to my mind), but
definitely not for real world applications.

> Sorry if my beginner's questions sound like that, but I have started
> trying to teach myself php from a position of almost complete ignorance,
> especially in the way servers work. My previous experience of using a
> 'server', if you can call it that, was programming in AlgolW under
> Multics on an ICL System 4 mainframe in the 1970s; what little
> programming I have done since then has been on desktop machines.

No problem with that. It's just that most things *can* be done in a much
easier way nowadays and therefore *should* be done that way.

Bye,
Stefan

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[Message index]

		Nested PHP By: adrian on Mon, 10 February 2014 20:24
		Re: Nested PHP By: Jerry Stuckle on Mon, 10 February 2014 20:56
		Re: Nested PHP By: adrian on Mon, 10 February 2014 21:44
		Re: Nested PHP By: Jerry Stuckle on Mon, 10 February 2014 21:51
		Re: Nested PHP By: Peter H. Coffin on Tue, 11 February 2014 14:14
		Re: Nested PHP By: Jerry Stuckle on Tue, 11 February 2014 14:27
		Re: Nested PHP By: Peter H. Coffin on Wed, 12 February 2014 00:41
		Re: Nested PHP By: Jerry Stuckle on Wed, 12 February 2014 01:03
		Re: Nested PHP By: adrian on Wed, 12 February 2014 10:13
		Re: Nested PHP By: Tim Streater on Wed, 12 February 2014 10:33
		Re: Nested PHP By: Jerry Stuckle on Wed, 12 February 2014 11:30
		Re: Nested PHP By: adrian on Wed, 12 February 2014 12:52
		Re: Nested PHP By: The Natural Philosoph on Wed, 12 February 2014 13:11
		Re: Nested PHP By: Denis McMahon on Thu, 13 February 2014 06:55
		Re: Nested PHP By: Peter H. Coffin on Thu, 13 February 2014 18:02
		Re: Nested PHP By: Stefan+Usenet on Wed, 12 February 2014 12:14
		Re: Nested PHP By: The Natural Philosoph on Mon, 10 February 2014 22:09
		Re: Nested PHP By: Christoph Michael Bec on Mon, 10 February 2014 22:23
		Re: Nested PHP By: Tim Streater on Mon, 10 February 2014 22:27
		Re: Nested PHP By: Geoff Muldoon on Mon, 10 February 2014 22:30
		Re: Nested PHP By: Denis McMahon on Mon, 10 February 2014 23:06
		Re: Nested PHP By: Jerry Stuckle on Tue, 11 February 2014 01:46
		Re: Nested PHP By: adrian on Tue, 11 February 2014 10:11
		Re: Nested PHP By: Tim Streater on Tue, 11 February 2014 11:17
		Re: Nested PHP By: adrian on Tue, 11 February 2014 12:01
		Re: Nested PHP By: Tim Streater on Tue, 11 February 2014 12:45
		Re: Nested PHP By: Christoph Michael Bec on Tue, 11 February 2014 12:55
		Re: Nested PHP By: Denis McMahon on Tue, 11 February 2014 13:29
		Re: Nested PHP By: adrian on Tue, 11 February 2014 14:31
		Re: Nested PHP By: Denis McMahon on Tue, 11 February 2014 17:24
		Re: Nested PHP By: Jerry Stuckle on Tue, 11 February 2014 13:15
		Re: Nested PHP By: adrian on Tue, 11 February 2014 14:31
		Re: Nested PHP By: Jerry Stuckle on Tue, 11 February 2014 15:10
		Re: Nested PHP By: adrian on Tue, 11 February 2014 15:31
		Re: Nested PHP By: Jerry Stuckle on Tue, 11 February 2014 16:24
		Re: Nested PHP By: adrian on Wed, 12 February 2014 10:13
		Re: Nested PHP By: Jerry Stuckle on Wed, 12 February 2014 11:33
		Re: Nested PHP By: Ben Bacarisse on Tue, 11 February 2014 15:26
		Re: Nested PHP By: Ben Bacarisse on Tue, 11 February 2014 14:41
		Re: Nested PHP By: adrian on Tue, 11 February 2014 15:31
		Re: Nested PHP By: Ben Bacarisse on Tue, 11 February 2014 15:53
		Re: Nested PHP By: Jerry Stuckle on Tue, 11 February 2014 16:26
		Re: Nested PHP By: bill on Tue, 11 February 2014 12:12
		Re: Nested PHP By: Mr Oldies on Wed, 12 February 2014 14:33
		Re: Nested PHP By: Denis McMahon on Thu, 13 February 2014 06:47
		Re: Nested PHP By: Scott Johnson on Thu, 13 February 2014 13:01
		Re: Nested PHP By: Evan Platt on Fri, 14 February 2014 15:19
		Re: Nested PHP By: Scott Johnson on Fri, 14 February 2014 18:43
		Re: Nested PHP By: Arno Welzel on Sun, 02 March 2014 14:54
		Re: Nested PHP By: adrian on Sun, 02 March 2014 18:10
		Re: Nested PHP By: The Natural Philosoph on Mon, 03 March 2014 11:38
		Re: Nested PHP By: Arno Welzel on Mon, 17 March 2014 14:26
		Re: Nested PHP By: Jerry Stuckle on Mon, 17 March 2014 14:52
		Re: Nested PHP By: The Natural Philosoph on Mon, 17 March 2014 15:33
		Re: Nested PHP By: Peter H. Coffin on Mon, 17 March 2014 22:10
		Re: Nested PHP By: The Natural Philosoph on Mon, 17 March 2014 23:01
		Re: Nested PHP By: Christoph Michael Bec on Mon, 17 March 2014 23:31
		Re: Nested PHP By: The Natural Philosoph on Tue, 18 March 2014 13:10
		Re: Nested PHP By: Gabriel on Mon, 17 March 2014 15:18

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