[SOLVED] Disallow certain characters from a field

[webref.eu]

I'd like to check a field for the following characters: 

 

< > @

 

and tell the user they aren't allowed to use them.  What's the easiest way to do this?

 

Thanks All.

[Fadion]

The easiest way i can think of right now, should be:

 

<?php
$str = 'phpfreaks@';
if(strpos($str, '@')){ //you can do this for all the other characters using OR strpos($str, '<') and so on
     echo '@ found';
}
?>

 

but im sure there are fancier ways.

[waynew]

Or:

 

stristr();

[Fadion]

stristr() is the case-insensitive strstr(), where in the manual it is stated:

 

Note: If you only want to determine if a particular needle occurs within haystack , use the faster and less memory intensive function strpos() instead.

 

Not that it will make a lot of difference, but just to let you know.

[waynew]

It would matter if the function is being used constantly. Good call.

[webref.eu]

Thanks guys, I have used the suggested solution.

 

Rgds