Re: [PHP] what's the difference in the following code?
On Oct 23, 2008, at 2:10 PM, Jochem Maas wrote: The order is reversed, so if $host has a non-zero length, it is not escaped. first thing that I noticed, second wondering why no charset was specified, thirdly was wondering why it's not plain: $host = htmlentities($host); but nonetheless your point stands, :-) Yeah, fair enough. To my credit, I also noticed the problem without spending more than a second or two on that line, but I also recognized how it could be missed. To me, it's similar to missing when someone calls a functions and gets the order of arguments wrong. You can tell what they meant, so the error doesn't stand out as boldly. Perhaps subconsciously you anticipate that they're right, because in most of the code, they are. The challenge of being perfect is why I've developed a number of tools to help me out. I'm going to release one of the best of these as open source in a few months. I might mention that on this list, since it seems appropriate. Hopefully no one will mind the advertising too much. :-) now about that charset ... your blog post uses UTF-7 to demonstrate the potential for problems ... but htmlentities() doesn't support that charset, or at least not according to the docs, in fact the list of supported charsets is quite limited, out of curiosity what would your recommendation be if one is faced with a having 'htmlentize' a string encoded in UTF-7 or some other charset not supported by htmlentities()? That's a good question. I would probably convert it to something like UTF-8, escape it, then convert it back. I've never faced this situation, and the scenario I was recreating in my post was when someone attacked Google using UTF-7. Google didn't actually want to support that character encoding. If you specify ISO-8859-1 in your Content-Type header, it's actually fine to omit the character encoding in htmlentities(), because it uses that by default. (Also, not all mismatches are exploitable.) However, it always catches my eye, because it demonstrates a lax treatment of character encoding in general. I like to see it explicitly declared everywhere. a second question: strip_tags() doesn't have a charset parameter, how does it manage to cope without knowing the input string encoding? or does it not and is it actually vulnerable to maliciously encoded input? My guess would be that it doesn't cope. :-) I never use strip_tags(), so someone else might be able to offer a much better answer. Hope that helps, and thanks for the discussion. Chris -- Chris Shiflett http://shiflett.org/ -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] what's the difference in the following code?
The difference between the examples are still nothing, it do the same. But I never use the short version of if, because when I look after some month in some projects I have a better overview when there is a long if , its much easier to extend. As explained a couple of times already - there is not supposed to be a difference. It's about security and making code maintainance easier. [quote to Chris's former post] (..) imagine you're manually reviewing a colleague's code, and you're looking through a few thousand lines to try to help identify security problems. (..) [end quote] It's the old What's good code and what's bad code? discussion. In this case ternary operations are bad code. sorry for my bad english Die Code tun nicht Unterschiede in Execution. Es ist Sicherheits Frage. sorry for my bad German //A yeti -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] what's the difference in the following code?
On Oct 17, 2008, at 1:58 PM, Lamp Lists wrote:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this
is not good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
I believe I was trying to emphasize how simple, obvious code can be a
boon to security. I'm sure I could have picked a better example, but
let me show you a line of code I noticed in a security audit just
yesterday (only the variable name has been changed to be generic):
$host = strlen($host) 0 ? $host : htmlentities($host);
We have developed tools to help us find things like this, but imagine
you're manually reviewing a colleague's code, and you're looking
through a few thousand lines to try to help identify security problems.
In this particular example, my first thought was to suggest specifying
the character encoding when using htmlentities(), and making sure this
matches the Content-Type header, to avoid things like this:
http://shiflett.org/blog/2005/dec/google-xss-example
You might also be distracted by the comparison of strlen() to 0, since
it seems like you could simply rely on a boolean evaluation of
strlen() instead.
Can you spot the bigger problem?
The order is reversed, so if $host has a non-zero length, it is not
escaped.
When spending mere seconds per line, on average, reviewing a lot of
code, this is exactly the sort of thing that's not that hard to miss.
The real question is whether it would be slightly harder to miss if
expanded:
if (strlen($host) 0) {
$host = $host;
} else {
$host = htmlentities($host);
}
I think it's much less likely to be overlooked when written like this,
and this is the sort of decision that many developers take for
granted. If you're too proud to admit that the ternary is less
obvious, or too proud to admit that you could ever make a mistake like
this, maybe you can at least convince yourself that not everyone is as
clever as you, and code that is easier to review is ultimately going
to be better code.
Hope that helps,
Chris
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Re: [PHP] what's the difference in the following code?
On Thu, 2008-10-23 at 11:00 -0400, Chris Shiflett wrote:
On Oct 17, 2008, at 1:58 PM, Lamp Lists wrote:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this
is not good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
I believe I was trying to emphasize how simple, obvious code can be a
boon to security. I'm sure I could have picked a better example, but
let me show you a line of code I noticed in a security audit just
yesterday (only the variable name has been changed to be generic):
$host = strlen($host) 0 ? $host : htmlentities($host);
We have developed tools to help us find things like this, but imagine
you're manually reviewing a colleague's code, and you're looking
through a few thousand lines to try to help identify security problems.
In this particular example, my first thought was to suggest specifying
the character encoding when using htmlentities(), and making sure this
matches the Content-Type header, to avoid things like this:
http://shiflett.org/blog/2005/dec/google-xss-example
You might also be distracted by the comparison of strlen() to 0, since
it seems like you could simply rely on a boolean evaluation of
strlen() instead.
Can you spot the bigger problem?
The order is reversed, so if $host has a non-zero length, it is not
escaped.
That was the first thing I noticed. What I still don't understand is why
bother with the strlen? An empty string marked up with htmlentities() is
still an empty string. Now the code has two functions invoked when the
string is non-empty rather than one... htmlentities().
Cheers,
Rob.
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Re: [PHP] what's the difference in the following code?
At 11:00 AM -0400 10/23/08, Chris Shiflett wrote:
On Oct 17, 2008, at 1:58 PM, Lamp Lists wrote:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said
this is not good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
I believe I was trying to emphasize how simple, obvious code can be
a boon to security.
That's the way I read what you wrote and your example was fine with me.
The problem here is that the OP simply misunderstood what you were
trying to convey. Because of a language problem, he did not realize
that you were simply showing how a tainted variable could stand-out
in one set of code while being obscured in another. Instead, he
thought you were saying that one method was secure and the other
wasn't and wanted to have someone explain the difference.
I did my best to convey what I thought you were saying, but all
clarifications lead to more confusion.
Cheers,
tedd
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Re: [PHP] what's the difference in the following code?
Chris Shiflett schreef:
On Oct 17, 2008, at 1:58 PM, Lamp Lists wrote:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this
is not good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
I believe I was trying to emphasize how simple, obvious code can be a
boon to security. I'm sure I could have picked a better example, but let
me show you a line of code I noticed in a security audit just yesterday
(only the variable name has been changed to be generic):
$host = strlen($host) 0 ? $host : htmlentities($host);
We have developed tools to help us find things like this, but imagine
you're manually reviewing a colleague's code, and you're looking through
a few thousand lines to try to help identify security problems.
In this particular example, my first thought was to suggest specifying
the character encoding when using htmlentities(), and making sure this
matches the Content-Type header, to avoid things like this:
http://shiflett.org/blog/2005/dec/google-xss-example
You might also be distracted by the comparison of strlen() to 0, since
it seems like you could simply rely on a boolean evaluation of strlen()
instead.
Can you spot the bigger problem?
The order is reversed, so if $host has a non-zero length, it is not
escaped.
first thing that I noticed, second wondering why no charset was specified,
thirdly was wondering why it's not plain:
$host = htmlentities($host);
but nonetheless your point stands, :-)
now about that charset ... your blog post uses UTF-7 to demonstrate the
potential for problems ... but htmlentities() doesn't support that charset,
or at least not according to the docs, in fact the list of supported charsets
is quite limited, out of curiosity what would your recommendation be
if one is faced with a having 'htmlentize' a string encoded in UTF-7 or
some other charset not supported by htmlentities() ?
a second question: strip_tags() doesn't have a charset parameter, how does
it manage to cope without knowing the input string encoding? or does it
not and is it actually vulnerable to maliciously encoded input?
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Re: [PHP] what's the difference in the following code?
On Oct 17, 2008, at 1:58 PM, Lamp Lists wrote:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this is
not good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
The difference between the examples are still nothing, it do the same.
But I never use the short version of if, because when I look after some
month in some projects I have a better overview when there is a long if ,
its much easier to extend.
sorry for my bad english
greetz
Thomas
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Re: [PHP] what's the difference in the following code?
OP = original poster (in this case I guess)
http://acronyms.thefreedictionary.com/OP
So it's all about making code readable and probably easier to maintain
(even people unfamiliar with the script).
Doesn't that render the ternary operator IF-statement unnecessary?
Have I been totally wrong using it in countless scripts of mine
(always thought it's a neat way to do if )?
Somebody please tell me that I do not have to rewrite my code base
now, since I care about security.
Btw. PHP's ternary inconsistency here ..
http://en.wikipedia.org/wiki/%3F:#Inconsistency_of_implementations
And how about this ..
switch(isset($_GET['search'])) {
case true:
$search = $_GET['search'];
break 1;
default:
$search = '';
}
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Re: [PHP] what's the difference in the following code?
tedd schreef: At 6:37 AM -0700 10/20/08, Lamp Lists wrote: - Original Message From: tedd [EMAIL PROTECTED] To: Lamp Lists [EMAIL PROTECTED]; php-general@lists.php.net Sent: Monday, October 20, 2008 8:25:50 AM Subject: Re: [PHP] what's the difference in the following code? At 10:58 AM -0700 10/17/08, Lamp Lists wrote: I'm reading Essential PHP Security by Chris Shiflett. on the very beginning, page 5 6, if I got it correct, he said this is not good: NO, you did not get it correct. how it's so obvious? I can't see it either? -ll Re-read those paragraphs. He was not telling you that one way was better than the other. He WAS saying that one way showed the tainted variable more obvious than the other -- that's all. I hate it when people take things out of context and misquote others. Chris did not say that one way was better, or different, than the other. But rather he used two sets of code to illustrate a point. seems to me the point being illustrates is not at all objective in it's premise. I find the the ternary syntax easier to read/grok than the 3 liner. in both cases you need to understand the 'if' context to see when the variable is tainted. all that can be said is that one way is more obvious that the other to *Chris*, which doesn't do anybody but Chris much good ... obviously it's a rather silly point ... the useful parts of Chris' work revolve around where he explains *how* to validate/cleanse the tainted value ... extracting the goodness is a matter of evaluating and possibly disregarding statements/information which are secondary and/or irrelevant. Again, re-read those paragraphs. Cheers, tedd -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] what's the difference in the following code?
At 2:44 AM -0700 10/21/08, Yeti wrote: Somebody please tell me that I do not have to rewrite my code base now, since I care about security. You do not have to rewrite your code because you use ternary operators! Nobody said that. Again, Chris was not saying that it was the use of the operator that was a security issue, but rather its use could obscure the fact that the operator, as in the case he provided, could produce a tainted variable. Perhaps I've confused what Chris tried to say -- so, I suggest that everyone who is interested in arguing this point further buy Chris' book and read it for themselves. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] what's the difference in the following code?
At 10:58 AM -0700 10/17/08, Lamp Lists wrote:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this
is not good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
to me is more the way you like to write your code (and I like the
top one :-) )?
thanks.
-ll
The problem here is you have to read and understand what the author
is trying to say.
Chris is NOT saying that there is a difference between these two
forms of code. He is saying that one hides the fact that the variable
($search) is tainted while the other makes it more obvious.
The whole point of the first few pages is to show you how a variable
can be tainted and how you can minimize that by following some very
simple rules, one of which was simplicity, which you had problems
following.
With just a little reading, you could have answered your own question.
Cheers,
tedd
PS: I'm back
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Re: [PHP] what's the difference in the following code?
- Original Message
From: tedd [EMAIL PROTECTED]
To: Lamp Lists [EMAIL PROTECTED]; php-general@lists.php.net
Sent: Monday, October 20, 2008 8:25:50 AM
Subject: Re: [PHP] what's the difference in the following code?
At 10:58 AM -0700 10/17/08, Lamp Lists wrote:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this
is not good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
to me is more the way you like to write your code (and I like the
top one :-) )?
thanks.
-ll
The problem here is you have to read and understand what the author
is trying to say.
Chris is NOT saying that there is a difference between these two
forms of code. He is saying that one hides the fact that the variable
($search) is tainted while the other makes it more obvious.
The whole point of the first few pages is to show you how a variable
can be tainted and how you can minimize that by following some very
simple rules, one of which was simplicity, which you had problems
following.
With just a little reading, you could have answered your own question.
Cheers,
tedd
how it's so obvious? I can't see it either?
-ll
PS: I'm back
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Re: [PHP] what's the difference in the following code?
At 6:37 AM -0700 10/20/08, Lamp Lists wrote: - Original Message From: tedd [EMAIL PROTECTED] To: Lamp Lists [EMAIL PROTECTED]; php-general@lists.php.net Sent: Monday, October 20, 2008 8:25:50 AM Subject: Re: [PHP] what's the difference in the following code? At 10:58 AM -0700 10/17/08, Lamp Lists wrote: I'm reading Essential PHP Security by Chris Shiflett. on the very beginning, page 5 6, if I got it correct, he said this is not good: NO, you did not get it correct. how it's so obvious? I can't see it either? -ll Re-read those paragraphs. He was not telling you that one way was better than the other. He WAS saying that one way showed the tainted variable more obvious than the other -- that's all. I hate it when people take things out of context and misquote others. Chris did not say that one way was better, or different, than the other. But rather he used two sets of code to illustrate a point. Again, re-read those paragraphs. Cheers, tedd -- --- http://sperling.com http://ancientstones.com http://earthstones.com -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] what's the difference in the following code?
On Mon, Oct 20, 2008 at 10:02 AM, tedd [EMAIL PROTECTED] wrote: I hate it when people take things out of context and misquote others. Chris did not say that one way was better, or different, than the other. But rather he used two sets of code to illustrate a point. Welcome back, Grum-pa. Glad to see you're willing to flame people whose first language is not English. ;-P -- /Daniel P. Brown http://www.parasane.net/ [New Look] [EMAIL PROTECTED] || [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] what's the difference in the following code?
At 10:12 AM -0400 10/20/08, Daniel Brown wrote:
On Mon, Oct 20, 2008 at 10:02 AM, tedd [EMAIL PROTECTED] wrote:
I hate it when people take things out of context and misquote others. Chris
did not say that one way was better, or different, than the other. But
rather he used two sets of code to illustrate a point.
Welcome back, Grum-pa. Glad to see you're willing to flame people
whose first language is not English. ;-P
If he wanted my advice in a different language, then he should have
asked his question in that language. That way I could have ignored
him in mine. Besides, I'm not flaming in his language, so that should
balance out.
In this case, the introduction chapter of Chris' PHP Security clearly
states several things one can do to simplify the task of security.
One of which is to understand that the way you code can hide tainted
variables.
Chris illustrated his tainted point by asking the reader to compare
these two structures:
[1]
$search = isset($_GET['search']) ? $_GET['search'] : '';
[2]
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
He ALSO said that:
-- quote
The approach is identical, but one line draws in particular nows
draws much attention:
$search = $_GET['search'];
Without altering the logic in any way, it is now more obvious whether
$search is tainted and under what conditions.
-- un-quote
Now, instead of the OP getting the point the OP flies off on a
tangent asking us what's the difference in the following code? and
of course the answer is There is no difference. BUT, Chris didn't
say there was, as was implied by the OP in his post.
Sure I can understand language problems, but this thread was started
because the OP couldn't understand a simple concept that was stated
in less than ten (10) sentences. Our collective replies amounted to
more lines than that -- with the obvious language problems the OP has
with the written word, who knows what the OP thinks now.
But the point is that Chris did not say there WAS a difference as was
implied by the OP -- and that was my point.
Cheers,
tedd
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Re: [PHP] what's the difference in the following code?
- Original Message
From: tedd [EMAIL PROTECTED]
To: php-general@lists.php.net
Sent: Monday, October 20, 2008 4:15:02 PM
Subject: Re: [PHP] what's the difference in the following code?
At 10:12 AM -0400 10/20/08, Daniel Brown wrote:
On Mon, Oct 20, 2008 at 10:02 AM, tedd [EMAIL PROTECTED] wrote:
I hate it when people take things out of context and misquote others. Chris
did not say that one way was better, or different, than the other. But
rather he used two sets of code to illustrate a point.
Welcome back, Grum-pa. Glad to see you're willing to flame people
whose first language is not English. ;-P
If he wanted my advice in a different language, then he should have
asked his question in that language. That way I could have ignored
him in mine. Besides, I'm not flaming in his language, so that should
balance out.
In this case, the introduction chapter of Chris' PHP Security clearly
states several things one can do to simplify the task of security.
One of which is to understand that the way you code can hide tainted
variables.
Chris illustrated his tainted point by asking the reader to compare
these two structures:
[1]
$search = isset($_GET['search']) ? $_GET['search'] : '';
[2]
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
He ALSO said that:
-- quote
The approach is identical, but one line draws in particular nows
draws much attention:
$search = $_GET['search'];
Without altering the logic in any way, it is now more obvious whether
$search is tainted and under what conditions.
-- un-quote
Now, instead of the OP getting the point the OP flies off on a
tangent asking us what's the difference in the following code? and
of course the answer is There is no difference. BUT, Chris didn't
say there was, as was implied by the OP in his post.
Sure I can understand language problems, but this thread was started
because the OP couldn't understand a simple concept that was stated
in less than ten (10) sentences. Our collective replies amounted to
more lines than that -- with the obvious language problems the OP has
with the written word, who knows what the OP thinks now.
But the point is that Chris did not say there WAS a difference as was
implied by the OP -- and that was my point.
some people just CAN'T understand there are some barriers in languages that
could cause misunderstanding.
true, I didn't understand chris' statement correctly and now, after tedd's
explanation is clear to me. and I thank to him.
though, I hate it (as sombody said) when I always regret to post
question and ask for help because of those arrogant php masters.
if you didn't uderstand, and most likely you didn't, I asked because I had a
problem and asked for help. not to be smart or flame something. I didn't
understand. But you don't KNOW how to answer to people without killing them
or at least slap them.
and using some local shortcuts (OP ?!?) could be rather annoying?
-ll
Cheers,
tedd
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Re: [PHP] what's the difference in the following code?
2008/10/17 Lamp Lists [EMAIL PROTECTED]:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this is not
good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
to me is more the way you like to write your code (and I like the top one :-)
)?
thanks.
-ll
Chris posts here, you might want to stfa for his address and cc him
the question to the list. Just be sure not to bug him offlist, that is
generally frowned upon.
--
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http://gibberish.co.il
א-ב-ג-ד-ה-ו-ז-ח-ט-י-ך-כ-ל-ם-מ-ן-נ-ס-ע-ף-פ-ץ-צ-ק-ר-ש-ת
ä-ö-ü-ß-Ä-Ö-Ü
Re: [PHP] what's the difference in the following code?
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this is not
good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
to me is more the way you like to write your code (and I like the top one :-)
)?
They appear to be the same (to me at least). Just remember that you
need to correctly sanitise or quote them before using them in a (for
example) SQL query. For example if $_GET['search'] contains single
quote, (or double quote), your query may break. Ensure you handle that
eventuality too.
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http://www.rgraph.org
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Re: [PHP] what's the difference in the following code?
On Fri, Oct 17, 2008 at 1:58 PM, Lamp Lists [EMAIL PROTECTED] wrote:
I'm reading Essential PHP Security by Chris Shiflett.
on the very beginning, page 5 6, if I got it correct, he said this is not
good:
$search = isset($_GET['search']) ? $_GET['search'] : '';
and this is good:
$search = '';
if (isset($_GET['search']))
{
$search = $_GET['search'];
}
what's the difference? I really can't see?
to me is more the way you like to write your code (and I like the top one :-)
)?
thanks.
-ll
In this exact context there's no real difference. But in the real
world when you need to validate that a input value is a number and has
a minimum of X, a maximum of X, then your ternary shortcut will not
cut it.
I still wouldn't write mine either of those ways. Look into
ext/filter [1] or Zend validators [2]. I'm of the school where you
shouldn't sanitize a value, but rather validate it and escape it
appropriately based on usage context. This takes a lot of discipline
can be dangerous if you forget even one spot.
[1] http://us3.php.net/manual/en/function.filter-input.php
[2] http://framework.zend.com/manual/en/zend.validate.html
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Re: [PHP] What's the Difference?
str_replace() doesn't have regex. Stephen wrote: I can't quite figure this out... What exactly is the difference between str_replace() and ereg_replace()? Don't they both do the exact same thing? Thanks, Stephen Craton http://www.melchior.us What is a dreamer that cannot persevere? -- http://www.melchior.us -- The above message is encrypted with double rot13 encoding. Any unauthorized attempt to decrypt it will be prosecuted to the full extent of the law. -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] What's the Difference?
...therefore it's faster. Only use it when you really need regexp functionality - same with all other functions which are dual straight string/regexp matching. Leif K-Brooks wrote: str_replace() doesn't have regex. Stephen wrote: I can't quite figure this out... What exactly is the difference between str_replace() and ereg_replace()? Don't they both do the exact same thing? Thanks, Stephen Craton http://www.melchior.us What is a dreamer that cannot persevere? -- http://www.melchior.us -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] What's the Difference?
Ok, you get the meaning even though my mail is confusing: only use *regexp functions* when you need regexp [etc] Bogdan Stancescu wrote: ...therefore it's faster. Only use it when you really need regexp functionality - same with all other functions which are dual straight string/regexp matching. Leif K-Brooks wrote: str_replace() doesn't have regex. Stephen wrote: I can't quite figure this out... What exactly is the difference between str_replace() and ereg_replace()? Don't they both do the exact same thing? Thanks, Stephen Craton http://www.melchior.us What is a dreamer that cannot persevere? -- http://www.melchior.us -- PHP General Mailing List (http://www.php.net/) To unsubscribe, visit: http://www.php.net/unsub.php
Re: [PHP] What's the difference between mail() in PHP and sendmail?
Nothing, really. I believe PHP's mail() actually calls sendmail directly (or whatever you have configured in php.ini). Also Mike Web user wrote: What's the difference between mail() in PHP and sendmail? Thanks! Mike -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] What's the difference between mail() in PHP and sendmail?
It can also use procmail, or any other SMTP-capable application you have installed. It is called from the php.ini file. Mike Frazer Nathan Cassano [EMAIL PROTECTED] wrote in message 392201c15e37$535ab3f0$2925ae3f@amos">news:392201c15e37$535ab3f0$2925ae3f@amos... Not a whole lot. The PHP mail function is just a nice fuzzy function wrapper to popen(sendmail). The gory details can be found at http://cvs.php.net/co.php/php4/ext/standard/mail.c?r=1.44. -Original Message- From: Web user [mailto:[EMAIL PROTECTED]] Sent: Friday, October 26, 2001 8:43 AM To: [EMAIL PROTECTED] Subject: [PHP] What's the difference between mail() in PHP and sendmail? What's the difference between mail() in PHP and sendmail? Thanks! Mike -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
Re: [PHP] What's the difference between echo and print?
on 8/6/01 12:32 PM, Phil Latio at [EMAIL PROTECTED] wrote:
What's the difference between echo and print?
this is definitely one of those frequently asked ones :)
a good place to start is
http://php.net/echo
http://php.net/print
http://php.net/printf
for info and user comments. i found a couple cool nuggets in there. here are
some things i believe are true.
print() is a function and you need the parantheses. print also returns
whether or not is was successful, as in
if (print($thing)) {
$thing_was_printed = 1;
} else {
$thing_was_printed = 0;
}
echo is not a function. it is a language construct. (i'm not sure of all the
implications of this) also, you do not need parantheses. so,
echo $thing;
is valid.
-- mike cullerton
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RE: [PHP] what's the difference between include and require??
Check this : http://www.weberdev.com/index.php3?GoTo=get_example.php3?count=22 Sincerely berber Visit http://www.weberdev.com Today!!! To see where PHP might take you tomorrow. -Original Message- From: Zenith [mailto:[EMAIL PROTECTED]] Sent: Monday, February 19, 2001 3:40 PM To: [EMAIL PROTECTED] Subject: [PHP] what's the difference between include and require?? Though I have read the manual about these two things, include() and require(), but I still not very clear about the difference between these?? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
RE: [PHP] what's the difference between include and require??
An unsuccessful include will give you an error.
An unsuccessful require will kill the program.
Also: require() statements cannot be embedded inside conditionals. For
example:
?PHP
if ($something) {
include("somefile.php") // this is okay.
}
if ($something) {
require("somefile.php") // this is wrong.
}
?
The reason: require() is taken care of on an initial pass of the parser,
which makes it faster than include(). Unfortunately, that means that the
parser doesn't check to see if it's embedded in a conditional statement.
Finally, unless you're using these functions to pull in actual HTML, as
opposed to code, think hard about using include_once() or require_once(),
which spares you those obnoxious "Cannot redefine function blah() in blah
blah blah" errors.
-
Sam Leibowitz ([EMAIL PROTECTED])
Project Manager
Business Technology Center
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Re: [PHP] what's the difference between include and require??
An unsuccessful include will give you an error. An unsuccessful require will kill the program. __John Monfort_ _+---+_ P E P I E D E S I G N S www.pepiedesigns.com "The world is waiting, are you ready?" -+___+- On Mon, 19 Feb 2001, Zenith wrote: Though I have read the manual about these two things, include() and require(), but I still not very clear about the difference between these?? -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED] -- PHP General Mailing List (http://www.php.net/) To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED] To contact the list administrators, e-mail: [EMAIL PROTECTED]
