Why not satisfy the condition or enter if output the user name format exception qaq

Why not satisfy the condition or enter if output username format error Qaq
Enter format to check the values of each variable


But strlen ($username) =9
Result1=1
Or will you run into if?
Output User name format error


This is the only paragraph in the entire code. "Bad User name format"
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 $posts =$_post;
foreach ($posts as $key = = $value) {
if (empty ($value))
Exit (' Illegal access! ');
}
foreach ($posts as $key = = $value) {
$posts [$key] = Trim ($value);
}
Require (' dbconfig.php ');
Registered
function register ($username, $password, $email) {
$query = "Insert UserData values ('". $username. "', '". $password. "', '". $email. "')";
$result =mysql_query ($query);
if (! $result) {
Exit (' Registration failed!PAPAP ');
Die (' Registration failed '. Mysql_error ());
}
else{
echo "registered successfully!";
}
}
Check user name, password, mailbox format
function Verifyformat ($username, $password, $email) {
$result 1=preg_match ("/^[\x{4e00}-\x{9fa5}]+$/u", $username);
if (strlen ($username) <1 | | strlen ($username) >16 | | result1==0) {
echo "User name format is wrong!";
return false;
Die ("User name format is wrong!");
}

$result 2=preg_match ("/^\w+$/u", $password);
if (strlen ($password) <6 | | strlen ($password) >17 | | result2==0) {
echo "Bad password format!";
return false;
Die ("Bad password format!");
}

$result 3=preg_match ("/^[a-za-z\d]+@[a-za-z\d]+\.[ Com|cn|com.cn|net]+$/u ", $email);
if (result3==0) {
echo "Bad mailbox format!";
return false;
Die ("Bad mailbox format!");
}
return true;
}
$flag =verifyformat ($posts [' username '], $posts [' Password '], $posts [' email '];
if ($flag)
Register ($posts [' username '], $posts [' Password '], $posts [' email '];
Else
Die ("Registration failed!!..");
?>

------Solution--------------------
The owner said the right.

