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How to automatically create a page after a user fills out a form via PHP?

Say I have a form with two input fields, a title and a comment. After the user fills in two fields and sends the data, a page is automatically created containing the title and comment that the user enters in a folder located in the root directory, for example, www.root.com/page/ will contain an automatically created page.

Update:

I would like the form data to be sent to the SQL table row with the URL of the automatically generated page in the same SQL row as the title and comment.

How to do it using PHP?

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<?php
//Template for basic page
$template = <<<EOD
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title><!--TITLE--></title>
</head>

<body>
<!--COMMENT-->
</body>
</html>
EOD;

//handle the posted form
if(isset($_POST['title'])&&isset($_POST['comment'])){
    //replace the areas of the template with the posted values
    $page = str_replace('<!--TITLE-->',htmlentities($_POST['title']),$template);
    $page = str_replace('<!--COMMENT-->',htmlentities($_POST['comment']),$page);
    //create a name for the new page
    $pagename = md5($_POST['title']).'.html';

    //db connect & select
    $db=mysql_connect('localhost','user','pass');
    mysql_select_db('yourdb');

    //check if page already exists
    $result = mysql_query('SELECT pagename from yourtable WHERE url="'.mysql_real_escape_string($pagename).'"');
    if(mysql_num_rows($result)>=1){
        $notice = '<p>Page already created <b>./pages/'.$pagename.'</b></p>';
    }else{
        //inset new page into db
        mysql_query('INSERT into yourtable (`id`,`title`,`comment`,`url`)VALUES("",
        "'.mysql_real_escape_string(htmlentities($_POST['title'])).'",
        "'.mysql_real_escape_string(htmlentities($_POST['comment'])).'",
        "'.$pagename.'")');
        //put the created content to file
        file_put_contents('./pages/'.$pagename,$page);
        //make a notice to show the user
        $notice = '<p>New Page created <b>./pages/'.$pagename.'</b></p>';
    }
}
?>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Language" content="en-gb">

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Make page example</title>
</head>

<body>
<?php
//if the notice is set then display it
if(isset($notice)){echo $notice;} ?>
<form method="POST" action="">
  <p>Title:<input type="text" name="title" size="31"></p>
  <p>Comment:</p>
  <p><textarea rows="5" name="comment" cols="21"></textarea></p>
  <p><input type="submit" value="Submit"></p>
</form>
</body>
</html>
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