How do I create a new .html webpage onclick?

What I want to do is when the user clicks my html button I want to dynamically create a new webpage on the server. I need the url of the new webpage to have it's own url, that is, it should be different from each other.

In more detail: When the user clicks the button I want to upload a new .html file to the server. So for example if I have a website called www.check.com/index.html when the user clicks the button in the index.html I need to create a new .html that contains some html lines (but no CSS, nothing will be shown on the page). So when the user clicks the button I want a file to be upload to the server with a unique url like www.check/1.html, the second time it'll be check.com/2.html and so on.. I'm fine with it being 1.html, 2.html and so on.

Javascript code:

 function makePage(){
var xmlhttp = new XMLHttpRequest();
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState==4 && xmlhttp.status==200)
    alert("webpage " + xmlhttp.responseText + " was successfully created!");
}
var content = "<html><head></head><body><meta name=\"twitter:card\" content=\"summary_large_image\"><meta name=\"twitter:site\" content=\"@nytimes\"><meta name=\"twitter:creator\" content=\"@SarahMaslinNir\"><meta name=\"twitter:title\" content=\"Parade of Fans for Houston’s Funeral\"><meta name=\"twitter:description\" content=\"Blah Blah Blah content.\"><meta name=\"twitter:image\" content=\"\"><script>document.getElementById(\"imgTweet\").innerHTML.write(img);</script></body></html>";
xmlhttp.open("GET","makePage.php?content=" + content,true);
xmlhttp.send();}

'img' is a variable in a different page of mine. The webpage gets created by the code is not executed.

Solution

You must use AJAX to execute php. Creating new file in php is really simple with file_put_contents().

here is an example:
makePage.html:

    <html>
    <body>
    <button onclick="makePage()">click</button>
    <script src="makePage.js">
    </script>
    </body>
    </html>

makePage.php:

<?php
$content = $_GET["content"];
$file = uniqid() . ".html";
file_put_contents($file, $content);
echo $file;
?>

makePage.js

function makePage(){
    var xmlhttp = new XMLHttpRequest();
    xmlhttp.onreadystatechange = function(){
    if(xmlhttp.readyState==4 && xmlhttp.status==200)
        alert("webpage " + xmlhttp.responseText + " was successfully created!");
    }
    var content = "<html><head><meta charset=\"utf-8\" /> </head><body>new website<script>alert(\"test\")</script></body></html>";
    xmlhttp.open("GET","makePage.php?content=" + content,true);
    xmlhttp.send();
}

hope this will help