problem with white space

[greedyisg00d]

how can I prevent users from inputting a series of whitespace in a textbox for example if the user inputted a series of whitespace only, it will display an error message.

Thanks

[dagon]

depends on what is valid for that input, all white space can be removes with str_repalce(), if however you need to allow it for a space between words use preg repalce to remove more than one in a row:

$str = preg_replace('/\s\s+/', ' ', $str);

after either is done you can just use empty() to check that there was something other than white space entered.