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This function can be used to validate usernames (or other strings). The maximum and minimum length of the username can be set. Also you are allowed to set the allowed characters.
| <html>
<head>
<title>Username Validity</title>
</head>
<body>
<?php
// During user registration we may want to limit the length and characters used in username
// This function can help you do that. It returns true if valid else false.
function is_valid_username($username){
// Enter other valid characters below
static $valid_chars = "._+?";
static $min_length = 5;
static $max_length = 15;
if(!eregi("^[a-z0-9$valid_chars]{".$min_length.",".$max_length."}$",$username)){
return false;
}
return true;
}
?>
</body>
</html> | |
Usage Example
| <?php
// Call the function is_valid_username with the username as the argument
$username = "gerhard";
if(is_valid_username($username)){
echo "$username is valid";
} else {
echo "$username is invalid";
}
?> | |
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