第三关（跨越检验）

<?php
<p>code.txt</p>

if (isset ($_GET[‘password‘])) {
     
    if (preg_match ("/^[a-zA-Z0-9]+$/", $_GET[‘password‘]) === FALSE) //要求含有数字字母，正则表达式匹配
    {
        echo ‘<p>You password must be alphanumeric</p>‘;
    
    }
      else if (strlen($_GET[‘password‘]) < 8 && $_GET[‘password‘] > 9999999)//长度<8,数值>9999999
    {    
    
        if (strpos ($_GET[‘password‘], ‘*-*‘) !== FALSE)//包含*-*
        {
            die(‘Flag: ‘ . $flag);
        }
        else
        {
            echo(‘<p>*-* have not been found</p>‘);
        }
    }
    else
    {
        echo ‘<p>Invalid password</p>‘;
    }
}
?>