Tag Archives: Script

PHP Script to fix AJAX Access-Control-Origin Errors

February 23, 2011 8:26 pm /

If you have an AJAX application that uses a PHP back-end app on a different server as your web front-end server (e.g. load balancing, cdn’s, etc), your PHP script will need to send header variables with the allowed content server name(s).

Web browsers are now following a standard for HTTP Access control to prevent client-side Cross Site scripting attacks.

I tested this with Firefox and it simply blocks the request without any error messages. Google Chrome browser will error out with the following message if the access control origin is not set correctly on your PHP script. (woot!)

“XMLHttpRequest cannot load [PHP URL].. Origin [JAVASCRIPT URL] is not allowed by Access-Control-Allow-Origin.”

For example, if the Javascript is hosted on example.com and your PHP app is on example.org.

Read More →

Posted in: AJAX, PHP / Tagged: , ,

PHP: Display page render time

June 12, 2009 2:06 pm /

Here’s what I currently use to determine how long it takes to generate a page in PHP. Its only 4 lines of code.

PHP 5

$time_start = microtime(true);
$time_end = microtime(true);
$time = $time_end - $time_start;
echo "Displaying the render time: $time seconds\n";

PHP 4 Version: (8 lines)

Put this at the top of the PHP script:

$render_time_start = microtime_float();

Put this at the end of the script:

$render_time_end = microtime_float();
$render_time = $render_time_end - $render_time_start;
echo $render_time;

function microtime_float(){
list($usec, $sec) = explode(" ", microtime());
return ((float)$usec + (float)$sec);
}

Posted in: PHP / Tagged: , ,

PHP Uptime check

November 24, 2008 4:49 pm /

I found a useful script in PHP that can be used for checking uptime of a server. It can be useful for checking when the servers have a such a significant load that pages can’t be displayed. The benefit or running it locally is that I can configure the script to perform failover functionality if necessary. Online uptime services are good too, but most of them aren’t free. Maybe I should force the server to show a failwhale when the site gets too busy… j/k 😀

Here’s the link to the script.
http://www.programmingtalk.com/showthread.php?t=34999



Posted in: PHP / Tagged: , ,