check length of username

[ryza_]

Hello,

when a new user joins up at my site i want to check to make sure there username isnt to long, i am currently using this.

if(!eregi("[0-9a-z]{4,10}$", $username)) {
print "bad input\n";
}
else{
print "good input\n";
}

this works fine, it checks to make sure the username is atleast 4 letters and numbers long, and checks for unwanted characters, but what it isnt doing is checking to make sure the username isnt longer then 10 chars.

How can i check this?

Best Wishes
ryza

[examancer]

this would do it:

if (strlen($username) <= 10) {
  // good username
} else {
  // bad username
}

[tha_mink]

Why not just do it at the form and save the cpu cycles....

<input type="text" name="username" size ="10" MAXLENGTH="10">

[examancer]

because. forms aren't reliable, they can be circumvented, so you must check at the server! And, checking a string length takes about the same amount of cpu power as sending the extra max length attribute to the client.