! (not)

[jwb666]

I have a problem with using the ‘not’ (!) condition.

At start I had this:

if( eregi(".php", $userfile_name) || eregi(".jsp", $userfile_name) )
{
echo ("Problem: File is a disallowed file type.”);
exit;
}

This is code to block PHP or JavaScript files from being uploaded – an it worked alright; the disallowed files produced an error message, and other files where allowed.

However I changed the code and it failed – I changed it to this:

if( !eregi(".zip", $userfile_name) || !eregi(".html", $userfile_name) )
{
echo ("Problem: File must be a zip file or a HTML file.”);
exit;
}

This time I want to only allow .zip files and HTML files. But it echoes the ‘Problem: File must be…’ even if the file is a .zip or .html

It also happens when I use forms – and check for blank fields using the isset() function.

if( !isset(‘$example_field’ )
{
echo(“Please fill out all required fields”);
}

This always echoes the message saying the field is blank – even if it isn’t..

I have read examples that use !isset() and I think it should work – what am I doing wrong?

I have also tried:

if( isset(‘$example_field’ == “false” )
#I’ve tried “false without quotes – and with single quotes but it doesn’t change anything
{
echo(“Please fill out all required fields”);
}

It still doesn’t work!

Any help would be extremely appreciated! 🙂

[mrhappiness]

if (<a> or <b>) is the same as
if (!<a> and !<b>)

you have to use and instead of or (||) and it will work there once was a guy called moore who said this afair 😃

[jwb666]

It also happens when I use forms – and check for blank fields using the isset() function.

PHP:

if( !isset(‘$example_field’ )
{
echo(“Please fill out all required fields”);
}

---

This always echoes the message saying the field is blank – even if it isn’t..

What about that? I dont use any || or && and it stil doesn't work! Thanks about the other though!

[mrhappiness]

correct:

if (isset($var))

wrong:

if (isset('$var'))

[Shrike]

eregi() invokes the PHP regexp engine, so you need to escape special chars like '.'

if( !eregi("\\.zip", $userfile_name) || !eregi("\\.html", $userfile_name) )

http://uk2.php.net/manual/en/function.eregi.php