Function to strip returns

[JackM]

I'm trying to write a function that will trim and strip new line
character returns from submitted $_POST values. Does this look serviceable?

function trim_data($form data)
{
foreach ($formdata as $key => $value)
{
$value = preg_replace("( \r\n|\n|\r|\t)" , "", $value);
$newdata[trim($key)] = trim($value);

}
return $newdata;
}

[ZeldorBlat]

Re: Function to strip returns

Sure, or just use:

$value = str_replace(arr ay("\r", "\n", "\t"), '', $value);

It's probably a little bit faster than preg_replace().

[Ewoud Dronkert]

Re: Function to strip returns

JackM wrote:[color=blue]
> $value = preg_replace("( \r\n|\n|\r|\t)" , "", $value);[/color]

That is not a pattern, it needs pattern delimiters at the start and end.
You don't need the parentheses because there's nothing outside them. Use a
quantifier to match series of newlines/tabs. Use a character class to
match different combinations of characters. I always use single quotes
around patterns to minimize the use of backslashes.

$value = preg_replace('/[\r\n\t]+/', '', $value);

--
E. Dronkert

[JackM]

Re: Function to strip returns

JackM wrote:
[color=blue]
> I'm trying to write a function that will trim and strip new line
> character returns from submitted $_POST values. Does this look serviceable?
>
> function trim_data($form data)
> {
> foreach ($formdata as $key => $value)
> {
> $value = preg_replace("( \r\n|\n|\r|\t)" , "", $value);
> $newdata[trim($key)] = trim($value);
>
> }
> return $newdata;
> }[/color]

ZeldorBlat wrote:
[color=blue][color=green]
>> $value = str_replace(arr ay("\r", "\n", "\t"), '', $value);[/color][/color]

Ewoud Dronkert wrote:
[color=blue]
> $value = preg_replace('/[\r\n\t]+/', '', $value);[/color]


Interesting. So what would the preferred method be or is that just
splitting hairs?

[Ewoud Dronkert]

Re: Function to strip returns

JackM wrote:[color=blue]
> ZeldorBlat wrote:
>[color=green][color=darkred]
> >> $value = str_replace(arr ay("\r", "\n", "\t"), '', $value);[/color][/color]
>
> Ewoud Dronkert wrote:
>[color=green]
> > $value = preg_replace('/[\r\n\t]+/', '', $value);[/color]
>
>
> Interesting. So what would the preferred method be or is that just
> splitting hairs?[/color]

In principle, I say prefer str_replace. Maybe if $value contained lots of
consecutive \r, \n or \t, the regexp might even be a little faster?
Actually I didn't think about the possibility to use an array argument for
str_replace so just used a regexp, with which I'm quite comfortable.

--
E. Dronkert

[Adam i Agnieszka Gasiorowski FNORD]

Re: Function to strip returns

On 2005-10-31 08:41:59 +0000, Ewoud Dronkert
<firstname@last name.net.invali d> said:
[color=blue]
> JackM wrote:[color=green]
>> $value = preg_replace("( \r\n|\n|\r|\t)" , "", $value);[/color]
>
> That is not a pattern, it needs pattern delimiters at the start and end.
> You don't need the parentheses because there's nothing outside them. Use a
> quantifier to match series of newlines/tabs. Use a character class to
> match different combinations of characters. I always use single quotes
> around patterns to minimize the use of backslashes.
>
> $value = preg_replace('/[\r\n\t]+/', '', $value);[/color]



You are right about the delimiters, but
wrong about the pattern. I did not test
it, but using a greedy quantifier instead
of alternative is not a good idea. I would
write it as a non capturing (?:) and put
the most probable alternative first, which
is, correctly, \r\n (Windows), the rest of
them don't matter that much as in almost 9/10
PCRE engine will end matching at the first
branch (it short-circuits) ---- Windows clients
are 90%+ of all accessing web pages. Feel free to
correct me if I'm wrong.

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