Author Archives: Jan Willem

Terrible experience with BDO Groningen

For my company I hired an accountant in Groningen, The Netherlands. In my case BDO Groningen. They also advice on taxes but unfortunately don’t understand that their clients benefit from paying less taxes. An advice I received was described too … Continue reading

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WordPress 3.5 – Image / Gallery Media uploader to custom plugin / meta box (easy)

With this simple and relative short code you can add the WordPress 3.5 Media Uploader to your own plugins. It will return single or multiple images and returns them in a comma seperated list. If you want to return other … Continue reading

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Fixing WordPress error: An error occurred in the upload. Please try again later

I’ve been spending a considerable amount of time in fixing the WordPress error:¬†An error occurred in the upload. Please try again later. I received this error when trying to add image upload functionality to my own custom plugin. I had … Continue reading

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Google now also reports about old versions of software

When I logged in to Google Webmastertools today I was presented with a message that I’m using an old version of Vbulletin on one of my websites. Vbulletin is currently in the 4.x.x. version but in the 3.x.x versions there … Continue reading

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WordPress wp_list_comments callback explanation

When working with comments you might want to drastically change the appearance of the comments. You can use a new comment template with which you call from the template where you want to list the comments. But if you want … Continue reading

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WordPress get_comment_meta and update_comment_meta

WordPress now features a function to allow you to store meta data for each comment. Just like it’s able to do so for posts. It seems that, under the hood, WordPress has functionality that potentially prepares it for metadata on … Continue reading

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Features to expect in WordPress 3.2 (to be released Q2/Q3 2011)

WordPress 3.1 has just been released and I, as a WordPress addict, am already searching for information on WordPress 3.2. This release is scheduled for the first half of 2011. One thing seems to be sure, WordPress 3.2 will no … Continue reading

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How to make WPML compatible with W3C Total Cache

If you’re a heavy user of WordPress and use WMPL together with W3C Total Cache then you might have found out that it doesn’t work properly when using alias domains for each language. The language switcher doesn’t work correctly anymore. … Continue reading

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Retrieve server/host Windows version

Not one of the easiest jobs, is retrieving the version information of your Windows computer with PHP. Other methods are available, but they don’t show you the exact version, usually just report WINNT or similair strings. The code below will … Continue reading

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WordPress shortcode output buffer versus appending to string

When your develop a Wordpress plugin there is a big chance that you will need to include a shortcode. If you simply echo each line, you will notice that your output will not appear on the right place. This is because Wordpress will output your code as soon as it encounters the echo. Therefore you should use a different way to get your output on the page. This will ensure that the output will appear on the place where you’ve added the shortcode. Continue reading

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