php value problem

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Hello all,

I'm a learning php this year but i encounters some problems.

One of them is about php value. The problem is how do i do to prevent a php file from resending the same values into the database whenever the page is refreshed?

Anyone help?

Thanks,

Asep

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komrad

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Light Poster

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since Sep 2006

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Oct 13th, 2008

Re: php value problem

The only way that I know of doing this is redirecting after the post. For such a reason I usually process my posts on a separate file and then redirect back.

R0bb0b

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Posting Shark

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since Jun 2008

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Oct 14th, 2008

Re: php value problem

or check for main fields of that post form...then i can be prevented...
for example...

php Syntax (Toggle Plain Text)
$seq="select count(*) as cnt from tablename where username='".$_POST['username']."'";
sres=mysql_query($seq);
	$srow=mysql_fetch_assoc($sres);	
 
	if($srow['cnt']>0) {
 
		$errmsg="User with this Username already existed.";
 
	} else 
{
//do your insert operations..
}
$seq="select count(*) as cnt from tablename where username='".$_POST['username']."'";
sres=mysql_query($seq);
	$srow=mysql_fetch_assoc($sres);	
	
	if($srow['cnt']>0) {
	
		$errmsg="User with this Username already existed.";
		
	} else 
{
//do your insert operations..
}

and for empty fields doing client side validation is better...

Last edited by Shanti C; Oct 14th, 2008 at 1:14 am.

Shanti C

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