I’ve just tried to update one of my CentOS 6.2 servers that was built from an older AMI, only to find that the yum update command stopped unexpectedly with several dependency errors. They all pointed to something called “qpid”, and I must admit that I’ve never heard of it – nor did I know that … Read more
Version 6.x of Apple’s AirPort Utility displays all your wireless client’s IP addresses, but it doesn’t show you wired devices. The old version 5.6 did, but without a hack it no longer runs on Mountain Lion. There is however a simple way to display all clients using the command line tool arp. Open up a … Read more
Installing WordPress Multisite isn’t the hard part – it’s getting your head around how to use it, especially if you’ve mostly been using single installs. In this quick tour I want to give you some pointers on how to use your new installation, and how it differs from single WordPress installations. New Role: The Super … Read more
Installing WordPress Multisite can give your site the benefit of being part of a network. I use this feature to spawn multiple installations that live on the same domain. It makes my life so much easier to update several WordPress instances at once. It’s also a great way of being logged into several individual sites … Read more
Creating a recurring automatic function in WordPress used to be one of the most difficult things for me to understand. Several articles out there explain how to do it, yet I always forgot the concepts when the next cron job job came along. Right now it’s in my head, and that’s the time when I … Read more
Many complex things are extremely simple in PHP – sending mail is one of them. Here’s how: // components for our email $recepients = ‘you@somewhere.com’; $subject = ‘Hello from PHP’; $message = ‘This is a test mail.’; // let’s send it $success = mail($recepients, $subject, $message); if ($success) { echo ‘Mail added to outbox’; } … Read more
Before we execute a shell command from PHP it’s a good idea to test if the server will respond to it. We can do this by making use of the empty() function. The following example consists of a helper function you can call before executing the command in question. Then we call it with the … Read more
If we’re executing shell commands via PHP we need to know if the server is running Windows or Linux. Thanks to a magic constant in PHP we can find out like this: echo PHP_OS; This will give us a single value like Linux Darwin Windows WINNT With that info at hand, we can write a … Read more
