[PHP] Is it possible to parse a variable by character?

It does not allow cross post to news server.... Posting again.

[Cross post to php-lang/php-general]
Regular expression functions can do the job and already have reply.

Answer for the original question: How to access string by character.

I'm not sure if accessing string as array is going to be depreciated or not.
(Or is it already depreciated???)
But you could do

$str = 'abc';
for ($i = 0; $i < strlen($i); $i++) {
  echo $str[$i];
}

It prints characters in string one by one.

I also not sure behavior of following code is defined or not.
(It's used to be undefined. You probably should not rely on this.)

$str = 'abc';
$str[0] = 'X';

You may get
$str = 'Xbc' or $str[0] = 'X'.

Anyone knows current status on this???

Regards,
--
Yasuo Ohgaki


"Sean Coyle" <[email protected]> wrote in message
news:B70272AA.D54%[email protected]...
> Hey there guys,
>
>     This may seem like a dumb question, but I have to ask it anyway.
>
> I have a form in one of my php based scripts that allows for file uploads.
> I recently noticed a potential issue if people upload files containing
> anything else but the standard characters ([_a-z0-9-]+(\.[_a-z0-9-]).
>
>     I am not sure if this can be done, but what I need to do is parse this
> variable (lets call it $file_name) by character looking for anything save
> letters a-z (A-Z) and numbers 0-9.  Any arrangements of numbers, letters and
> full stops (.) are to be permitted, and if any character does not meet those
> specifications, that single character should be converted to an underscore.
>
>     Any ideas on how I can go about doing something like this?
>
> BTW: (Some background info)  I examined the average validate e-mail idea,
> however, rather than reject the string, I would like to be able to 'replace'
> the offending character.
>
> Thanks in advance,
>
> Sean
>
>
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