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<?php 
    //set validation error flag as false
    $error = false;
    //check if form is submitted
    if (isset($_POST['submit']))
    {
        $name = trim($_POST['txt_name']);
        $fromemail = trim($_POST['txt_email']);
        $subject = trim($_POST['txt_subject']);
        $message = trim($_POST['txt_msg']);

//name can contain only alpha characters and space
        if (!preg_match("/^[a-zA-Z ]+$/",$name))
        {
            $error = true;
            $name_error = "Please Enter Valid Name";
        }
        if(!filter_var($fromemail,FILTER_VALIDATE_EMAIL))
        {
            $error = true;
            $fromemail_error = "Please Enter Valid Email ID";
        }
        if(empty($subject))
        {
            $error = true;
            $subject_error = "Please Enter Your Subject";
        }
        if(empty($message))
        {
            $error = true;
            $message_error = "Please Enter Your Message";
        }
        if (!$error)
        {
            //send mail
            $toemail = "me@mydomain.com";
            $subject = "Enquiry from Visitor " . $name;
            $body = "Here goes your Message Details: \n\n Name: $name \n From: $fromemail \n Message: \n $message";
            $headers = "From: $fromemail\n";
            $headers .= "Reply-To: $fromemail";

//if (mail ($toemail, $subject, $body, $headers))
                $alertmsg  = '<div class="alert alert-success text-center">Message sent successfully.  We will get back to you shortly!</div>';
            //else
            //    $alertmsg = '<div class="alert alert-danger text-center">There is error in sending mail.  Please try again later.</div>';
        }
    }
?>

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap 3 Contact Form Example</title>
    <meta content="width=device-width, initial-scale=1.0" name="viewport" >
    <link rel="stylesheet" href="css/bootstrap.min.css" type="text/css" />
</head>
<body>
<div class="container">
    <div class="row">
        <div class="col-md-6 col-md-offset-3 well">
            <form role="form" class="form-horizontal" action="<?php echo $_SERVER['PHP_SELF']; ?>" method="post" name="contactform">
            <fieldset>
                <legend>Bootstrap Contact Form</legend>

<div class="form-group">
                    <div class="col-md-12">
                        <label for="txt_email" class="control-label">Email ID</label>
                    </div>
                    <div class="col-md-12">
                        <input class="form-control" name="txt_email" placeholder="Your Email ID" type="text" value="<?php if($error) echo $fromemail; ?>" />
                        <span class="text-danger"><?php if (isset($fromemail_error)) echo $fromemail_error; ?></span> 
                    </div>
                </div>

<div class="form-group">
                    <div class="col-md-12">
                        <label for="txt_subject" class="control-label">Subject</label>
                    </div>
                    <div class="col-md-12">
                        <input class="form-control" name="txt_subject" placeholder="Your Subject" type="text" value="<?php if($error) echo $subject; ?>" />
                        <span class="text-danger"><?php if (isset($subject_error)) echo $subject_error; ?></span>
                    </div>
                </div>

<div class="form-group">
                    <div class="col-md-12">
                        <label for="txt_msg" class="control-label">Message</label>
                    </div>
                    <div class="col-md-12">
                        <textarea class="form-control" name="txt_msg" rows="4" placeholder="Your Message"><?php if($error) echo $message; ?></textarea>
                        <span class="text-danger"><?php if (isset($message_error)) echo $message_error; ?></span>
                    </div>
                </div>