Php and HTML validations

 <form name="addEvent" id="addEvent" action="appointment.php" onsubmit="" method="POST">
    <fieldset>
        <legend>Add Calendar Event:</legend><br>
            <label>Name</label>
                <input type="text" id="nitle" name="title" value="" maxlength="255"><span id="name1"></span><br><br>
            <label>Date</label>
                <select id="month" name="month">
                    <option value="0">Month</option>
                    <option value="1">January</option>
                    <option value="2">February</option>
                    <option value="3">March</option>
                    <option value="4">April</option>
                    <option value="5">May</option>
                    <option value="6">June</option>
                    <option value="7">July</option>
                    <option value="8">August</option>
                    <option value="9">September</option>
                    <option value="10">October</option>
                    <option value="11">November</option>
                    <option value="12">December</option> &nbsp;
                </select>
                <select id="day" name="day">
                    <option value="0">Date</option>
                    <option value="1">1</option>
                    <option value="2">2</option>
                    <option value="3">3</option>
                    <option value="4">4</option>
                    <option value="5">5</option>
                    <option value="6">6</option>
                    <option value="7">7</option>
                    <option value="8">8</option>
                    <option value="9">9</option>
                    <option value="10">10</option>
                    <option value="11">11</option>
                    <option value="12">12</option>
                    <option value="13">13</option>
                    <option value="14">14</option>
                    <option value="15">15</option>
                    <option value="16">16</option>
                    <option value="17">17</option>
                    <option value="18">18</option>
                    <option value="19">19</option>
                    <option value="20">20</option>
                    <option value="21">21</option>
                    <option value="22">22</option>
                    <option value="23">23</option>
                    <option value="24">24</option> 
                    <option value="25">25</option>
                    <option value="26">26</option>
                    <option value="27">27</option>
                    <option value="28">28</option>
                    <option value="29">29</option>
                    <option value="30">30</option>
                    <option value="31">31</option> 
                </select>
                <select id="year" name="year">
                    <option value="0">Year</option>
                    <option value="2015">2015</option>
                    <option value="2016">2016</option>
                </select><span id="year1"></span><span id="date1"></span><br><br>
            <label>Start Time</label>
                <input type="text" id="starttime" name="starttime" value="" placeholder="HH:MM" maxlength="7" >
            <br>
            <label>Contact E-mail</label>
                <input type="text" id="email" name="email" placeholder="email@domain.com" maxlength="80"><span id="email1"></span><br><br><br>
            <input type="submit" id="submit" value="Add Event">&nbsp; &nbsp;
            <input type="reset" id="reset" value="Reset Fields">
    </fieldset> 
  </form>

PHP外部....不想放 html 文件...

<?php
    $name = $_POST['name'];
    $month = $_POST['month'];
    $day = $_POST['day'];
    $year = $_POST['year'];
    $starttime = $_POST['starttime'];
    $email = $_POST['email'];

    if (strlen($name) < 3) {
        echo '* Name must be at least 3 characters long' . '<br>';
        }
    if ($month == 0) {
        echo '* Month must be chosen' . '<br>';
        }
    if ($day == 0) {
        echo '* Day must be chosen' . '<br>';
        }
    if ($year != 2016) {
        echo '* Year must be 2016' . '<br>';
        }
    if ($month == 2 && $day == 30) {
        echo '* Feb 30th is an invalid date' . '<br>';
        }
    if ($month == 2 && $day == 31) {
        echo '* Feb 31st is an invalid date' . '<br>';
        }
    if (empty($starttime)) {
        echo '* Must input valid  Appointment Time' . '<br>';
        }
    if (!filter_var($email, FILTER_VALIDATE_EMAIL)) {
        echo '* Must input valid email address' . '<br>';
        }
    else {
        echo '<br>' . 'Submission Successful!' . '<br>';
        }

?>

有没有人可以测试，看看这是否有效，每次我测试它都会给我无法发布/约会.php (我不太擅长 php，我想保持语法相同，因为我可以更轻松地阅读它并理解它在做什么(我也是否正确连接它