limit English character

[zedan_80]

Hallo

how can i limil the user input to English language ONLY

[bpat1434]

You could search for anything that is NOT english....

i.e.:
if(preg_match("@[^{a-zA-Z0-9\~`!@#$%^&*()_-+\={}[]\'\":\;\?\/><.\,|]*@",} $string)
{
// There are non-english characters....
}
else
{
// There are no non-english characters
}
?>[/code]

~Brett

[bradgrafelman]

 // $string is string of data to check for non-English characters

for($i = 0; $i < strlen($string); $i++)
     if(ord($string{$i}) < 32 || ord($string{$i}) > 126)
          die('english characters only.');

Of course, that also rules out line breaks. If you want to accept line breaks as well, you'd need...

for($i = 0; $i < strlen($string); $i++)
     if( (ord($string{$i}) < 32 || ord($string{$i}) > 126) && ord($string{$i}) != 10 && ord($string{$i}) != 13)
          die('english characters only.');

[bpat1434]

didn't even know you could do that Brad.... learn something new every day...

~Brett

[bradgrafelman]

I believe that's one of the purposes for this board! 🙂

All I did was glance at an ASCII table (link) to get the decimal value of normal english characters. [man]ord[/man] (opposite/compliment of [man]chr[/man]) returns the decimal value of a character, so it was just a matter of looping through each character in $string (curly braces seemed the easiest way) and check to see if the decimal value was outside the range of english characters.

At any rate, just thought I'd post a different way to go about it. Yours is probably more readable, as not everyone memorizes their decimal values for English characters apparently... :p