When you use one of the methods to query for posts (query_posts(), get_posts() or WP_Query object) arguments you provide are processed and turned into SQL query. This happens in WP_Query->&get_posts() method. Since arguments are not omnipotent there are a lot of hooks in there that allow to modify or override parts of resulting SQL query. … Read more
You may call the function too early. You have to wait until the action ‘plugins_loaded’ fires. wp_mail() is defined in wp-includes/pluggable.php. pluggable.php is loaded in wp-settings.php after the plugins are loaded but before ‘plugins_loaded’ is called. See this answer for an example.
Short Answer Yes, shortcodes are case sensitive Longer Answer It’s really easy to build a test case for this and see. <?php add_shortcode(‘sOme_ShOrTcOdE’, ‘wpse102375_shortcode’); function wpse102375_shortcode($args, $content=null) { return ‘yep’; } Longest Answer Read the source. The “magic” with shortcodes happens in do_shortcode, so let’s take a look at that. <?php // wp-includes/shortcode.php function do_shortcode($content) … Read more
The proper way to send a status (when WordPress is not available) is: http_response_code( 403 ); See the PHP Manual for its definition. But in Plugin files, this should never be the “default” code on top of a file header. See Worthwhile to restrict direct access of theme files? for a discussion. In WordPress, use … Read more
To add custom template in page attributes template section you have to first add your template to dropdown and load it in template_include hook when current page has selected it as current template. /** * Add “Custom” template to page attirbute template section. */ function wpse_288589_add_template_to_select( $post_templates, $wp_theme, $post, $post_type ) { // Add custom … Read more
Try get_the_ID() or global $post; $post->ID.
The book Digging into WordPress is a good start. I bought this myself. I found it to be full of useful resources. If you want plugin development then Professional WordPress Plugin Development is a great book. Another book I bought and I used it to develop my first plugin. Other places to keep visit are … Read more
The first one is like saying… Include the file found in the inc directory, above the directory where this file is located. The second statement is saying… in the server root (/) look in the inc folder for canagan_admin_functions.php and include it. The first one will work, the second won’t. In the second you’re looking … Read more
I can’t come up with good quote, but as far as I understand from chatter – pointers are not considered public (available for use outside core) for version 3.3 So essentially there is no API to use yet.
From what you write, it looks to me that you accidentially copied/tagged the whole /trunk directory in your SVN while tagging/branching. As the wordpress plugin directory just grabs the full directory that got tagged, the zip package was invalidated. You can recover from that. I once made the same mistake. Just do a full checkout … Read more