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    <p>That's not how PHP works. You're making a common thinking error, that a lot of beginners make, in that you seem to think that a <a href="http://en.wikipedia.org/wiki/Client_%28computing%29" rel="nofollow">client-side</a> language like Javascript, can interact with a <a href="http://en.wikipedia.org/wiki/Server_%28computing%29" rel="nofollow">server-side</a> language, such as PHP, in this fashion. This is due to a misunderstanding of the <a href="http://en.wikipedia.org/wiki/Client%E2%80%93server_model" rel="nofollow">client/server</a> and/or <a href="http://en.wikipedia.org/wiki/Request-response" rel="nofollow">request/response</a> model.</p> <p>When you request a web page with your browser (the client), your request is processed by the webserver (the server), that then returns a response, basically like this:</p> <pre><code> Client (browser) Server (webserver) --------------------------------------------------- Send page request -----&gt; Parse request (execute PHP) | \|/ Parse HTML response &lt;----- Send HTML response (and execute (there will be no Javascript, more PHP code in if that was part this response) of the response) </code></pre> <p>In other words: the client and server are two completely separated processes, that only communicate with each other based on a request/response principle.</p> <p>PHP cannot be executed on the client-side (save for the client-side version PHP-GTK, which we are not discussing here), and Javascript cannot be executed on the server-side (save for server-side versions of Javascript, which we are not discussing here). So, the PHP function <code>domaincheck</code> will not be available for the client to call, and the Javascript calls will not be received by the server.</p> <p>And so, if you don't want to request a complete web page again, but merely have a Javascipt function request and receive the output of a PHP function, you'd have to let Javascipt make another request to the server again ('in the background', meaning: without completely replacing the whole page in the browser), and have PHP create a response again, this time with output that Javascript can handle. This is typically known as <a href="http://en.wikipedia.org/wiki/Ajax_%28programming%29" rel="nofollow">AJAX</a> (Asynchronous JavaScript and XML). Although the response doesn't have to be XML. A <a href="http://en.wikipedia.org/wiki/JSON" rel="nofollow">JSON</a> response is very common. Fragments of HTML (or even complete HTML pages) are also possible.</p> <p><em>I'll probably add an example for you at some point in the near future.</em></p>
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    1. COthanks, but I got another code to work with this
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      1. USThomas Lai
 

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