The following small plugin creates a custom button inside line 1 of the WordPress TinyMCE Version 4, tested in WP Version 3.9-beta2. The plugin has var_dump included to understand the values. It’s also possible to add the button to other lines of the visual editor, only a other hook, like for line 2: mce_buttons_2. Result … Read more
get_template_part is a theme function. You can’t load plugin files with that function. Take a look at the source and you will notice the work is done by locate_template. Look at that source and you will see that it always loads from theme directories. However much you may want to use get_template_part it is the … Read more
You can use the remove_action() function, like this: remove_action(‘publish_post’, ‘old_action’); add_action(‘publish_post’, ‘new_action’); It’s important to note that if the old_action was added with a priority parameter, you must add that to the remove_action call, otherwise it will fail to remove it. There are other implications if the old_action was added within a class. See here … Read more
The problem can partially be addressed with a must-use plugin hooking into the plugins_url filter. It won’t handle all other cases where plugin_basename() is used, such as register_activation_hook() and co. More info: http://core.trac.wordpress.org/ticket/16953
TL;DR; Enqueue Using external stylesheet PRO: All your styles are in one spot. PRO: Reduces web page coding. PRO: Easier to maintain the plugin. PRO: Can use hooks to alter location of the file. PRO: Can use hooks to unqueue the file. PRO: Can use minify styles automatically. CON: Might add extra HTTP request (can … Read more
The API you offer in a plugin or a theme depends on the logic of that specific code. There is probably no guide that applies to all situations. I am a contributor for multiple plugins with APIs, and what I have learned so far is: Do not offer an API until you really know how … Read more
Here are some random thoughts on this: Question #1 How much money did we send to grandma? For 100 page loads, we sent her 100 x $1 = $100. Here we actually mean 100 x do_action( ‘init’ ) calls. It didn’t matter that we added it twice with: add_action( ‘init’,’send_money_to_grandma’ ); add_action( ‘init’,’send_money_to_grandma’ ); because … Read more
1. Write with localization in mind Don’t use echo or print() to produce text output, instead use the WordPress functions __() and _e(): /** Not localization friendly */ echo “Welcome to my plugin”; // OR print(“Welcome to my plugin”); /** Localization friendly */ _e(‘Welcome to my plugin’, ‘my-plugin’); // OR $my_text = __(‘Welcome to my … Read more
wp_mail() is a pluggable function: It can be replaced by plugins. That’s useful in cases where the regular mail() doesn’t work (good enough), for example when you need extra authentication details. Example: WP Mail SMTP wp_mail() uses PHPMailer by default, a sophisticated PHP class which offers a lot of useful preprocessing and workarounds for cases … Read more
I found a solution as an automated service over at http://wpseek.com/pluginfilecheck/ It’s does exactly, what was asked for including the generation of list of used functions and giving a suggestion for the Plugin-Header comments.