PHP 函数没有返回值

由于某种原因，我无法让我的函数返回字符串......

$password = crypt_password_input($password, "");

//Encrypt Password longer than 8 characters
function crypt_password_input($inputPassword, $newPassword)
{
    $passwordLength = strlen($inputPassword);

    if($passwordLength > 8){
        $encryptString = substr($inputPassword, 0, 8);
        $inputPassword = substr($inputPassword, 8);
        $newPassword .= crypt($encryptString, "HIDDENSALT");
        crypt_password_input($inputPassword, $newPassword);
    }else{
        $newPassword .= crypt($inputPassword, "HIDDENSALT");
        echo "Final: " . $newPassword . "<br/>";
        return $newPassword;
    }
}


echo "Encrypted from the input: " . $password . "<br/>";

这是该脚本的输出...

最终：ltu1GUwy71wHkltVbYX1aNLfLYltEZ7Ww8GghfM
从输入加密：

你没有return该条件块下的语句。我在那里添加了退货。

if($passwordLength > 8)
{
    $encryptString = substr($inputPassword, 0, 8);
    $inputPassword = substr($inputPassword, 8);
    $newPassword .= crypt($encryptString, "HIDDENSALT");
    return crypt_password_input($inputPassword, $newPassword);
}