Store Form data in CSV Excel File by using PHP

In this way we can directly save data in csv file format in hosting folder with the help of PHP environment and that csv file easily access by MS Excel, LibreOffice and any other spreadsheet programs. Every data save in new row in selected excel file.
Source Code
<?php

$error = '';
$name = '';
$email = '';
$subject = '';
$message = '';

function clean_text($string)
{
 $string = trim($string);
 $string = stripslashes($string);
 $string = htmlspecialchars($string);
 return $string;
}

if(isset($_POST["submit"]))
{
 if(empty($_POST["name"]))
 {
  $error .= '<p><label class="text-danger">Please Enter your Name</label></p>';
 }
 else
 {
  $name = clean_text($_POST["name"]);
  if(!preg_match("/^[a-zA-Z ]*$/",$name))
  {
   $error .= '<p><label class="text-danger">Only letters and white space allowed</label></p>';
  }
 }
 if(empty($_POST["email"]))
 {
  $error .= '<p><label class="text-danger">Please Enter your Email</label></p>';
 }
 else
 {
  $email = clean_text($_POST["email"]);
  if(!filter_var($email, FILTER_VALIDATE_EMAIL))
  {
   $error .= '<p><label class="text-danger">Invalid email format</label></p>';
  }
 }
 if(empty($_POST["subject"]))
 {
  $error .= '<p><label class="text-danger">Subject is required</label></p>';
 }
 else
 {
  $subject = clean_text($_POST["subject"]);
 }
 if(empty($_POST["message"]))
 {
  $error .= '<p><label class="text-danger">Message is required</label></p>';
 }
 else
 {
  $message = clean_text($_POST["message"]);
 }

 if($error == '')
 {
  $file_open = fopen("contact_data.csv", "a");
  $no_rows = count(file("contact_data.csv"));
  if($no_rows > 1)
  {
   $no_rows = ($no_rows - 1) + 1;
  }
  $form_data = array(
   'sr_no'  => $no_rows,
   'name'  => $name,
   'email'  => $email,
   'subject' => $subject,
   'message' => $message
  );
  fputcsv($file_open, $form_data);
  $error = '<label class="text-success">Thank you for contacting us</label>';
  $name = '';
  $email = '';
  $subject = '';
  $message = '';
 }
}

?>
<!DOCTYPE html>
<html>
 <head>
  <title>How to Store Form data in CSV File using PHP</title>
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.0/jquery.min.js"></script>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" />
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
 </head>
 <body>
  <br />
  <div class="container">
   <h2 align="center">How to Store Form data in CSV File using PHP</h2>
   <br />
   <div class="col-md-6" style="margin:0 auto; float:none;">
    <form method="post">
     <h3 align="center">Contact Form</h3>
     <br />
     <?php echo $error; ?>
     <div class="form-group">
      <label>Enter Name</label>
      <input type="text" name="name" placeholder="Enter Name" class="form-control" value="<?php echo $name; ?>" />
     </div>
     <div class="form-group">
      <label>Enter Email</label>
      <input type="text" name="email" class="form-control" placeholder="Enter Email" value="<?php echo $email; ?>" />
     </div>
     <div class="form-group">
      <label>Enter Subject</label>
      <input type="text" name="subject" class="form-control" placeholder="Enter Subject" value="<?php echo $subject; ?>" />
     </div>
     <div class="form-group">
      <label>Enter Message</label>
      <textarea name="message" class="form-control" placeholder="Enter Message"><?php echo $message; ?></textarea>
     </div>
     <div class="form-group" align="center">
      <input type="submit" name="submit" class="btn btn-info" value="Submit" />
     </div>
    </form>
   </div>
  </div>
 </body>
</html>
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