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错误

PHP Fatal error: Uncaught Error: Call to undefined function MysqL_query() in /Applications/MAMP/htdocs/lprapp/config.PHP:23
Stack trace:#0 {main}
thrown in /Applications/MAMP/htdocs/lprapp/config.PHP on line 23

码

<?PHP

    $user = 'root';
    $password = 'root';
    $db = 'inventory';
    $host = 'localhost';
    $port = 8888;

    $link = MysqLi_init();
    $success = MysqLi_real_connect(
       $link,$host,$user,$password,$db,$port
    );

    ?>
    <?PHP
    $username = $_POST['username'];
    $password = $_POST['password'];
    $sql = MysqL_query("SELECT * FROM login WHERE username = '".$_POST['username']."' and password = '".md5($_POST['password'])."'");
    $row = MysqL_num_rows($sql);
    if($rom > 0 )
    {
      session_start();
      $_SESSION['username'] = $_POST['username'];
      $_SESSION['password'] = $_POST['password'];
      echo "login done";
    }else {
      echo "fail login ";
    }

    ?>