plugin-development - Read For Learn

Completely remove WP_Admin_Bar for specific user roles

Add the following to your functions.php file as detailed here. Disable Admin Bar for everyone: // Disable Admin Bar for everyone if (!function_exists(‘disable_admin_bar’)) { function disable_admin_bar() { // for the admin page remove_action(‘admin_footer’, ‘wp_admin_bar_render’, 1000); // for the front-end remove_action(‘wp_footer’, ‘wp_admin_bar_render’, 1000); // css override for the admin page function remove_admin_bar_style_backend() { echo ‘<style>body.admin-bar #wpcontent, … Read more

WordPress 4.5 deprecated get_currentuserinfo()

The answer lies within the wp_get_current_user() pluggable function. I simply changed the function name get_currentuserinfo() to wp_get_current_uesr() then made sure the returns were not boolean but return $current_user. This seems to be working well, including caching, etc. Hopefully this helps others. if ( ! function_exists( ‘wp_get_current_user’ ) ) : /** * This replacement function will … Read more

Strategies to implement selective loading of plugins

Filter option_active_plugins. You can change the result of get_option() here without actually changing the database. if ( defined( ‘DOING_AJAX’ ) && DOING_AJAX ) add_filter( ‘option_active_plugins’, ‘disable_plugins_temporary’ ); function disable_plugins_temporary( $plugins ) { // unset plugins you don’t need, then return $plugins; } Background wp_get_active_and_valid_plugins() calls get_option( ‘active_plugins’, array() ) to get the active plugins. In … Read more

Changing Plugin Load Order

Don’t touch the load order, change the activation order instead. A working example can be found in this answer.

Add async script

The script_loader_tag filter, added in version 4.1, addresses this issue. To add an async attribute to an enqueued script you can do: /** * Add an aysnc attribute to an enqueued script * * @param string $tag Tag for the enqueued script. * @param string $handle The script’s registered handle. * @return string Script tag … Read more

Unit tests – Dealing with dependencies

Is object injection really necessary? To be fully testable in isolation, code should avoid to instantiate classes directly, and inject any object that is needed inside objects. However, there are at least two exceptions to this rule: The class is a language class, e.g. ArrayObject The class is a proper “value object”. No need to … Read more

Accessing plugin settings in gutenberg

The WordPress way to access PHP variables with JavaScript is to use wp_localize_script(). function wpse_enqueue_scripts(){ wp_enqueue_script( ‘wpse’, PATH_TO . ‘script.js’ ); wp_localize_script( ‘wpse’, ‘credentials’, $credentials ); } add_action( ‘wp_enqueue_scripts’, ‘wpse_enqueue_scripts’ ); Then in your JavaScript, you can access the credentials like console.log( credentials );

How can I run AJAX on a button click event?

Start from a working code base.. add_action(‘in_admin_header’, ‘my_ajax_button’); function my_ajax_button() { echo ‘<a href=”#ajaxthing” class=”myajax”>Test</a>’; } add_action(‘admin_head’, ‘my_action_javascript’); function my_action_javascript() { ?> <script type=”text/javascript” > jQuery(document).ready(function($) { $(‘.myajax’).click(function(){ var data = { action: ‘my_action’, whatever: 1234 }; // since 2.8 ajaxurl is always defined in the admin header and points to admin-ajax.php $.post(ajaxurl, data, function(response) … Read more

Nonces can be reused multiple times? Bug / Security issue?

In WordPress, nonces are specific to the user, the action being performed, and the time. With regards to time, a nonce is valid for 24 hours, and changes every 12 hours. This is considered an acceptable trade-off, since using a real number-used-once would involve adding a tracking system and having storage of the used nonces. … Read more

Optimize shortcode callbacks

There is a very important programming principle: DRY – Don’t repeat yourself. Whenever you realize you are repeating almost the same job try to write an abstraction. For your pad* shortcodes this means: function get_padding( $atts ) { $args = shortcode_atts( array( ‘num’ => 10 ), $atts ); return str_repeat( ‘ ‘, (int) $args[‘num’] ); … Read more

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