plugin-development - Read For Learn

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

How to Change the Entire WordPress Admin panel Look and Feel?

Here’s a great codex article on the topic of creating administration theme: http://codex.wordpress.org/Creating_Admin_Themes And back to your question, you will want to load different stylesheets for different user roles, so you have to check who the current user is. Pay attention, the check is done using current_user_can() function and checking for administrator is not being … Read more

Add rewrite rule to permalink structure

1. Add a new rewrite rule: add_action(‘init’, function() { add_rewrite_rule(‘^dog/([^/]+)/?$’, ‘index.php?cat=dog&name=$matches[1]’, ‘top’); }, 10, 0); 2. Filter the post link: add_filter(‘post_link’, function($post_link, $post, $leave_name = false, $sample = false) { if ( is_object_in_term($post->ID, ‘category’, ‘DOG’) ) { $post_link = str_replace($post->ID . ‘-‘, ”, $post_link); } return $post_link; }, 10, 4); Try it in your functions.php. … Read more

How to prevent newline from appearing in shortcode?

The <br> tag is coming from wpautop(), which is one of a number of display filters added to the content via wp-includes/default-filters.php: // Display filters add_filter( ‘the_content’, ‘wptexturize’ ); add_filter( ‘the_content’, ‘convert_smilies’, 20 ); add_filter( ‘the_content’, ‘wpautop’ ); add_filter( ‘the_content’, ‘shortcode_unautop’ ); add_filter( ‘the_content’, ‘prepend_attachment’ ); add_filter( ‘the_content’, ‘wp_make_content_images_responsive’ ); … // Shortcodes add_filter( ‘the_content’, … Read more

Include third party Javascript library which is not included in WordPress

You need to use wp_script_is in order to check if the library you are willing to use has already been included by another plugin. As you can see the handle is important, if you change it to whatEverIWant.js, it will not recognize the library.

Customize plugin update “new version is available” text

Since the text is processed by _() function, then, of course, you can modify it using gettext filter. function change_update_notification_msg( $translated_text, $untranslated_text, $domain ) { if ( is_admin() ) { $texts = array( ‘There is a new version of %1$s available. <a href=”https://wordpress.stackexchange.com/questions/323927/%2$s” %3$s>View version %4$s details</a>.’ => ‘My custom notification. There is a new … Read more

Admin config screen without menu

Admin pages are basically spoken nothing else then a hook to a function, so it is technically not a problem to add your own pages without making use of the menu. I was not aware of an API function that allows you to register own pages with ease, but there is a helper function in … Read more

How to add option box in “Edit Post” plugin API?

Below is the example of a couple of checkboxes to set custom field values: // register the meta box add_action( ‘add_meta_boxes’, ‘my_custom_field_checkboxes’ ); function my_custom_field_checkboxes() { add_meta_box( ‘my_meta_box_id’, // this is HTML id of the box on edit screen ‘My Plugin Checkboxes’, // title of the box ‘my_customfield_box_content’, // function to be called to display … Read more

add_action with a class method is causing fatal errors

Try: <?php $class = new MyClass(); class MyClass { public function MyClass() { add_action(‘init’, array($this, ‘core’)); } public static function core() { echo “I never get to here”; } } ?>

Show Similar Post Titles ( Similar to Stack Exchange )

This will get you most of the way there, but the actual search is not perfect. It would be great if someone who knows more about $wpdb can help get a better result. If this is my original post title: SOPA is dead, woot! Then just a title of “SOPA” will find it, as will … Read more

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