Datepicker值不会发送到php中的电子邮件

I created one sample form. After submit the form all values are send to my email but selected Datepicker values not send to email.

<form action="" method="post" enctype="multipart/form-data">
        <input class="date-picker" name="arrival" id="datepicker">
          <div class="input-group-addon"><i class="fa fa-calendar"></i></div>    
        <input class="date-picker" name="departure" id="datepicker1"/>
            <div class="input-group-addon"><i class="fa fa-calendar"></i></div>
        <div class="col-lg-6 col-md-6">
                                                    <input type="text" placeholder="First Name *" name="fname" required>
                                                </div>
                                                <div class="col-lg-6 col-md-6">
                                                    <input type="text" placeholder="Last Name *" required name="lname">
                                                </div>
    <input type="submit" name="submit" value="submit">
        </form>
        <?php
        if(isset($_POST['submit'])){
        $fname = $_POST['fname'];
              $lname = $_POST['lname'];
        $arrival = $_POST['arrival'];
            $departure = $_POST['departure'];
        $secretinfo = $_POST['info'];

            
         
            if ($secretinfo == "")
            {
               $myemail = "rajkumar23@gmail.com";
        $emess.= "Arrival: ".$arrival. "
";
              $emess.= "Departure: ".$departure. "
";
        $emess.= "First Name: ".$fname."
";
               $emess.= "Last Name: ".$lname."
";
        $ehead = "From: ".$email."
";
               $subj = "Booking Enquiry from ".$fname." ".$lname."!";
               $mailsend=mail("$myemail","$subj","$emess","$ehead");
               if($mailsend){
        echo "success";
        }
        } 
        }
        ?>
                ?>

How to send the datepicker values into email.

</div>

You just need to remove extra space from arrival field:

<input class="date-picker" name="arrival " id="datepicker" required>

Use like that:

<input class="date-picker" name="arrival" id="datepicker" required>

name="arrival " this will return you Undefined Index error.

One more thing, always use php error_reporting() in your development mode not for production mode.

I didn't find the submit button in your code, i hope you are using in your application.


Update 1:

You need to remove quote from mail()

$mailsend=mail("$myemail","$subj","$emess","$ehead");

Should be:

$mailsend=mail($myemail,$subj,$emess,$ehead);