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
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
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.
Nevermind, found out I can use get_the_ID();. This function will return the post id inside the the_content filter. The function simply declares the global $post object and returns its ID. add_filter(‘the_content’, ‘wpse51205_content’) wpse51205_content($content) { echo $content; // Echo out post content $PersonName = get_post_meta(get_the_ID(), ‘PersonName’, true); echo ‘Person: ‘ . $PersonName; } If you don’t … Read more
You cannot get these data. There are several issues with plugin usage tracking: No clear definition of a user: Think multi-site, local installations, intranets … Privacy: You would have to ask the user before you can activate tracking. There are many good reasons not to send any data to an unknown entity without consent (traffic, … Read more
Glad your taking the jump into wordpress, wordpress is an amazing platform for developers and non-developers alike, if you have knowledge of PHP, HTML, CSS (and jQuery in some instances) you will enjoy working with wordpress. A great place to start understanding wordpress would of-course be the wordpress website itself. http://codex.wordpress.org/Main_Page I hope this helps, … Read more