include/require cached and fopen is not?

[FFMG]

Hi,

Please help me settle a geek argument :).

I believe that php caches included code whenever possible.
So given the 2 files bellow.

// file.php
-------------------------------------
<?php
$value = 'Some value';
?>
-------------------------------------

// file.txt
-------------------------------------
Some value
-------------------------------------

If I try and 'use' both files to set a value.
-------------------------------------
EXAMPLE A
<?php
$value = '';
include 'file.php';
echo $value; // 'Some value'
?>
-------------------------------------

-------------------------------------
EXAMPLE B
<?php
$fd = @fopen( 'file.txt', 'rb');
$contents = '';
while (!feof($fd)) {
$contents .= fread($fd, 8192);
}
fclose($fd);
echo $contents; // 'Some value'
?>
-------------------------------------
Ignoring the fact that Example A is simpler.

Is it true that 'EXAMPLE A' will open the file, (file.php), and assign
$value only once and then not read the file anymore, (unless it is
changed).
I am talking about in the life of the php.exe process, not in the life
of the script run itself.

Whereas EXAMPLE B will open, read, close the file every single time
there is a page request.

What do you think? Does include open, read, close the file in every
request? Or will the content of both files be kept for the life of the
process?

Reagards,

FFMG
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[Jerry Stuckle]

FFMG wrote:

Hi,

Please help me settle a geek argument :).

I believe that php caches included code whenever possible.
So given the 2 files bellow.

// file.php
-------------------------------------
<?php
$value = 'Some value';
?>
-------------------------------------

// file.txt
-------------------------------------
Some value
-------------------------------------

If I try and 'use' both files to set a value.
-------------------------------------
EXAMPLE A
<?php
$value = '';
include 'file.php';
echo $value; // 'Some value'
?>
-------------------------------------

-------------------------------------
EXAMPLE B
<?php
$fd = @fopen( 'file.txt', 'rb');
$contents = '';
while (!feof($fd)) {
$contents .= fread($fd, 8192);
}
fclose($fd);
echo $contents; // 'Some value'
?>
-------------------------------------
Ignoring the fact that Example A is simpler.

Is it true that 'EXAMPLE A' will open the file, (file.php), and assign
$value only once and then not read the file anymore, (unless it is
changed).
I am talking about in the life of the php.exe process, not in the life
of the script run itself.

No, this is not correct. It will be done on every page request.

Whereas EXAMPLE B will open, read, close the file every single time
there is a page request.

Correct.

What do you think? Does include open, read, close the file in every
request? Or will the content of both files be kept for the life of the
process?

Reagards,

FFMG

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[the DtTvB]

FFMG wrote:

Hi,

Please help me settle a geek argument :).

I believe that php caches included code whenever possible.
So given the 2 files bellow.

// file.php
-------------------------------------
<?php
$value = 'Some value';
?>
-------------------------------------

// file.txt
-------------------------------------
Some value
-------------------------------------

If I try and 'use' both files to set a value.
-------------------------------------
EXAMPLE A
<?php
$value = '';
include 'file.php';
echo $value; // 'Some value'
?>
-------------------------------------

-------------------------------------
EXAMPLE B
<?php
$fd = @fopen( 'file.txt', 'rb');
$contents = '';
while (!feof($fd)) {
$contents .= fread($fd, 8192);
}
fclose($fd);
echo $contents; // 'Some value'
?>
-------------------------------------
Ignoring the fact that Example A is simpler.

Is it true that 'EXAMPLE A' will open the file, (file.php), and assign
$value only once and then not read the file anymore, (unless it is
changed).
I am talking about in the life of the php.exe process, not in the life
of the script run itself.

Whereas EXAMPLE B will open, read, close the file every single time
there is a page request.

What do you think? Does include open, read, close the file in every
request? Or will the content of both files be kept for the life of the
process?

Reagards,

FFMG

No, you are wrong. Stat functions are cached, but file reading and
writing are not.

On my IRC bot application, I want to change the response text without
restarting my bot, so I used 'include'.

Seems that PHP doesn't cache the included files.

[FFMG]

Jerry Stuckle;105090 Wrote:

>

No, this is not correct. It will be done on every page request.

Whereas EXAMPLE B will open, read, close the file every single time
there is a page request.

Correct.

Are you saying that the included scripts are revalidated every single
time?

That doesn't seem very efficient/logical to me.
Are you sure?

Surely some code is in memory.

FFMG
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[Jerry Stuckle]

FFMG wrote:

Jerry Stuckle;105090 Wrote:

>>
No, this is not correct. It will be done on every page request.

>>Whereas EXAMPLE B will open, read, close the file every single time
there is a page request.

Correct.

Are you saying that the included scripts are revalidated every single
time?

That doesn't seem very efficient/logical to me.
Are you sure?

Surely some code is in memory.

FFMG

Nope. They are revalidated every time. But it's pretty fast.

Examine the source code if you want. It's available on the PHP site.
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[FFMG]

Jerry Stuckle;105173 Wrote:

FFMG wrote:

Jerry Stuckle;105090 Wrote:

>
No, this is not correct. It will be done on every page request.

Whereas EXAMPLE B will open, read, close the file every single

time

>there is a page request.

Correct.

Are you saying that the included scripts are revalidated every

single

time?

That doesn't seem very efficient/logical to me.
Are you sure?

Surely some code is in memory.

FFMG

Nope. They are revalidated every time. But it's pretty fast.

Examine the source code if you want. It's available on the PHP site.

I am not doubting you, I just find it very strange that some code has
not been optimized.

I would have thought that some code, (or even sections of code), are
only parsed once.

That is why, (in the example given), I would have thought that EXAMPLE
A would be far more efficient than EXAMPLE B.
But essentially they are the same.

FFMG
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[Jerry Stuckle]

FFMG wrote:

Jerry Stuckle;105173 Wrote:

>FFMG wrote:

>>Jerry Stuckle;105090 Wrote:
No, this is not correct. It will be done on every page request.

Whereas EXAMPLE B will open, read, close the file every single

time

>>>>there is a page request.
>
Correct.

Are you saying that the included scripts are revalidated every

single

>>time?

That doesn't seem very efficient/logical to me.
Are you sure?

Surely some code is in memory.

FFMG

Nope. They are revalidated every time. But it's pretty fast.

Examine the source code if you want. It's available on the PHP site.

I am not doubting you, I just find it very strange that some code has
not been optimized.

I would have thought that some code, (or even sections of code), are
only parsed once.

That is why, (in the example given), I would have thought that EXAMPLE
A would be far more efficient than EXAMPLE B.
But essentially they are the same.

FFMG

And why are you surprised? Are you having a performance problem? Do
you see anyplace where this causes a problem? Parsing is quite fast. I
have never seen a performance problem cause by the parser.

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[Toby A Inkster]

FFMG wrote:

I believe that php caches included code whenever possible.

You believe incorrectly. However, there are add-ons available which do
this. eAccelerator is one -- it hooks itself straight into mod_php, so you
don't need to make any adjustments to your actual PHP scripts.

--
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[Geek of HTML/SQL/Perl/PHP/Python/Apache/Linux]
[OS: Linux 2.6.17.14-mm-desktop-9mdvsmp, up 19:43.]

It'll be in the Last Place You Look
http://tobyinkster.co.uk/blog/2007/11/21/no2id/

[Michael Fesser]

..oO(FFMG)

>Are you saying that the included scripts are revalidated every single
time?

That doesn't seem very efficient/logical to me.
Are you sure?

Surely some code is in memory.

Not by default. But there are code caches like APC available, which keep
the compiled bytecode in memory to speed up following requests.

Micha

[Kailash Nadh]

include() doesn't cache files. Thats why there is include_once() to
skip inclusion of a file, if it has already been included (in the
script's runtime)