plugin-development - Read For Learn

Get specific color from admin color scheme

Color schemes are registered globally within $_wp_admin_css_colors (see wp-includes/general-template.php for reference). You can return the colors for the current user depending on get_user_meta() for a specific settings page like this: global $pagenow; if ( $pagenow == ‘options-permalink.php’ ) : add_action( ‘admin_notices’, ‘get_current_user_admin_color’ ); function get_current_user_admin_color() { global $_wp_admin_css_colors; $user_admin_color = get_user_meta(get_current_user_id(), ‘admin_color’, true); echo ‘<pre>’; … Read more

Custom frontend page for plugin without a ‘physical’ page?

“What I need is to have for example site.com/mypage/ but I do not want ‘mypage’ to exist in the backend.” It’s a bit late, but maybe someone else is in a need for this as well: Step 1 Create /templates/ folder inside your plugin, and create custom.php file inside of it, with temporary content for … Read more

Is there widely accepted phpDoc syntax for documenting which hook calls a function?

Function doc block should document what it does, what it might be useful for, but not who uses it. It makes sense to document that it was designed with hook X in mind but that is it. Think of unit testing. In that context you are likely to call the function by itself without doing … Read more

Do I need to use WP_Filesystem when creating a downloadable file on the fly?

No. Keep in mind that the code sniffer is a limited utility operating on very simplistic parsing of the PHP code and has very little contextual knowledge. Therefor, you should use it as an advisory, a tool that should direct you to give a second thought to a part of your code, and not as … Read more

Init action hook running late after PayPal’s return url?

If I understand your question, the race condition you describe between WordPress knowing the transaction was “complete” and the user returning to your site is the problem. Regarding a potential solution, what about changing the way you’re approaching this such that this race condition is accepted as a real possibility rather than something that you … Read more

Show message on wordpress admin dashboard

When you redirect the user to the admin dashboard pass on a GET variable named “success_notice”, for example. So you get a URL like this: /wp-admin/index.php?success_notice=1. With that setup, just add the code that shows the success message on the dashboard only if that GET variable is set. add_action(‘admin_notices’, ‘wpse75629_admin_notice’); function wpse75629_admin_notice() { global $pagenow; … Read more

Writing a plugin that notify my friends of new post that mentions(@) them

Twice edited according to kaiser’s suggestions, unsecure version removed. <?php function my_email_friend($post_id = ”) { // get post object $post = get_post($post_id); // get post content $content = $post->post_content; // if @David exists if( 0 !== preg_match(‘/(@\w)/’, $content, $matches) ) $friend_display_name_like=”%” . like_escape($matches[0]) . ‘%’; else return; // do nothing if no matches global $wpdb; … Read more

Prevent notice and warnings in error_reporting?

Turn off WP_DEBUG because it overwrite your ini_set.

Update a Plugin while maintaining back compatibility: general

Class names are case insensitive in PHP (with one exception), so that should not be a problem. Accessing your main plugin instance for a class is possible with a static method get_instance() (example). You don’t have to build a Singleton for that. And it should not break backwards-compatibility. If you had public methods in your … Read more

Shortcode adding p and br tags

Not sure if this will be helpful to anyone else but the cause of the issue was a custom formatter the theme had: function my_formatter($content) { $new_content=””; $pattern_full=”{(\[raw\].*?\[/raw\])}is”; $pattern_contents=”{\[raw\](.*?)\[/raw\]}is”; $pieces = preg_split($pattern_full, $content, -1, PREG_SPLIT_DELIM_CAPTURE); foreach ($pieces as $piece) { if (preg_match($pattern_contents, $piece, $matches)) { $new_content .= $matches[1]; } else { $new_content .= wptexturize(wpautop($piece)); } … Read more

+ More