Category Archives: Development

Command Line WordPress with WP-CLI – WordPress Perth User Goup

Today at the WordPress Perth User Group October 2014 Meetup, I gave a presentation titled Command Line WordPress with WP-CLI.

These days my favourite uses of WP-CLI include:

  1. Performing search/replaces in the WordPress database
  2. Bulk importing/managing WordPress user accounts
  3. Installing WordPress
  4. Regenerating media library items

If you’re not already using WP-CLI, I suggest heading on over to wp-cli.org and installing it.

The command line isn’t as scary as it sounds 🙂

Command Line WordPress with WP-CLI

Tonight at the WordPress Melbourne User Group September 2013 Meetup, I gave a presentation titled Command Line WordPress with WP-CLI.

Video:

Slides:

 

Are you already using WP-CLI? If so, please let me know what your favourite WP-CLI command is.

If not, I suggest you go to wp-cli.org and give it a try 🙂

New in WordPress 3.6: the attachment_url_to_postid() Function

If you’re writing a WordPress plugin, you may have a scenario where you have an attachment (file) URL, and you’d like to obtain the associated post (attachment) ID.

Luckily, this is very easy to do in WordPress 3.6 because of the new attachment_url_to_postid() function.

The function’s syntax is simple – you pass it a string (the file URL), and it returns an integer (the associated post id), or zero on failure.

Here’s a simple example:

As mentioned above, this function is available in WordPress 3.6 – it will cause a fatal error if you try to use it in any earlier versions such as WordPress 3.5.x.

Thanks to Zack Tollman for the heads up about this handy new function.

Better Mobile Detection with WordPress’ wp_is_mobile() Function

Although WordPress themes typically use Responsive Web Design to tailor website for mobile devices, there is sometimes a need to use PHP (backend code) to detect whether the visitor’s web browser is running on a mobile device.

For example, there may be scenarios where you may want to output certain HTML markup (such as a mobile navigation menu) on mobile devices.

Alternatively, you may only want to output a slider containing large images on desktop and not mobile devices. Doing this via PHP (instead of CSS) means that the visitor’s mobile browser won’t have to download all of the slider images even though the slider is never displayed.

WordPress’ wp_is_mobile() function to the rescue!

wp_is_mobile() is a litte-known function built into WordPress that detects whether the visitor is using a mobile devices such as iPhone, iPad, Android, Silk, Kindle, BlackBerry, Opera Mini, and Opera Mobi.

The function was introduced in WordPress 3.4, and it can be used in a WordPress plugin or theme.

It’s a simple function that accepts no parameters, and returns a simple boolean (true/false) value.

Here’s a simple example:

Interestingly, WordPress core currently uses this function in a few different places:

  • To completely disable the Visual Editor for Opera Mini.
  • To enable jQuery UI Touch Punch in the WordPress dashboard for mobile devices.
  • To detect whether the current device can upload files.
  • To disable the “shake” effect on the WordPress login page when an incorrect username or password is entered using a mobile device.

Are you currently using the wp_is_mobile() function in your plugin or theme? If so, I’d love to hear what your use-case is.