AJAX and PHP

'TEXT: ' . $errStr . chr(10) .'LOCATION: ' . $errFile .', line ' . $errLine;echo $error_message;// prevent processing any more PHP scriptsexit;}?>6. Load http://localhost/ajax/foundations/proxyping/proxyping.html withyour favorite web browser (yes, even with Opera), and admire the random numberyou get.Chapter 3Figure 3.13: Using a Proxy PHP Script to Access the Remote ServerWhat Just Happened?The JavaScript code is allowed to access the server it was loaded from. We placed a script on theserver, called proxyping.php, which accesses the random number generator server on the behalfof the client.In order for the client to still have complete control over what kind of number to receive, we passthe min and max parameters to the PHP script, and the PHP script passes them in its turn to therandom number generator server. We don't pass the num parameter from the client because now wedon't want to give the client the option to ask for more than one number at a time. In this example,if the response is larger than 3 characters, we assume we received a server error report:// handles the response received from the serverfunction handleServerResponse(){// retrieve the server's responsevar response = xmlHttp.responseText;// if the response is longer than 3 characters, or if it is void, we assume// we just received a server-side error reportif(response.length > 3 || response.length == 0)throw(response.length == 0 ? "Server error" : response);89