为什么这个表格没有发送g-recaptcha-response？

Question

我正在尝试在网站上设置recaptcha。我以前做过这个，但我不知道为什么这不起作用。

以下是表格：

<form method="POST" action="emailProcess.php">
               <label for="fullName">First and Last Name</label>
                <br/>
               <input id="fullName" type="text" name="fullName" required>
                 <br/><br/>
               <label for="email">Email</label>
                <br/>
               <input id="email" type="text" name="email" required>
                 <br/><br/>
                 <label for="eventDate">Event Date</label>
                <br/>
               <input id="eventDate" type="text" name="eventDate">
        </div>

        <div class="contactRight">
               <label for="eventTime">Event Time</label>
                <br/>
               <input id="eventTime" type="text" name="eventTime">
                 <br/><br/>
               <label for="eventLocation" style="margin-top:5px;">Event Location</label>
                <br/>
               <input id="eventLocation" type="text" name="eventLocation">
                 <br/><br/>
               <label for="servicesRequested" style="margin-top:5px;">Service(s) Requested</label>
                <br/>
               <input id="servicesRequested" type="text" name="servicesRequested">
               <br/><br/>
        </div>

        <label for="howHear" style="margin-top:20px">How did you hear about us?</label>
        <textarea class="howHear" id="howHear" name="howHear" rows="4" cols="59"></textarea>
        <br/>
         <label for="comment" style="margin-top:20px">Extra Comments</label>
        <textarea class="comment" id="comment" name="comment" rows="4" cols="59"></textarea>
        <br/><br/>
        <div class="g-recaptcha" data-sitekey="my-sitekey-is-here"></div>
        <br/>
        <input class="submitButton" type="submit" value="Send Message">
        <button class="resetButton" type="reset" value="Reset Form">Reset Form</button>
        </form>

我将其包含在页面的标题中：<script src='https://www.google.com/recaptcha/api.js'></script>

在我尝试回显$_POST['g-recaptcha-response'];页面完全空白的页面上发送此信息。