Intermediate image generation is extremely rigid. image_resize() keeps it close to code and completely lacks hooks. Pretty much only option for this is to hook into wp_generate_attachment_metadata and overwrite WP-generated image with your own (which will need bit of a image_resize() fork). I need this for work so I might be able to share some … Read more
Yes, it is possible to create a plugin that extends another plugin. Here are a few ideas on how you might go about it: A plugin can set up its own action and filter hooks (using the do_action and apply_filter functions) just like the WordPress core does. If the plugin you are targeting does this, … Read more
I believe the best way to do this in a plugin is to run the following sample function when the pre_get_posts action hook is encountered. The $wp_query object is available, meaning your conditional tags are available, but before WordPress gets the posts, which means you are changing query vars prior to the first query being … Read more
You can look at the docs, but you’ll probably end up reading the real documentation: the source code. If you do, you’ll find that: GFFormsModel::get_leads($form_id) returns a list of entries for a form (maybe you know that one already), where each item in the array is itself an array, an “Entry object“ GFFormsModel::get_form_meta($form_id) returns a … Read more
WordPress functions are available only if WordPress is loaded. If you call your style.php directly you cannot use a WordPress function. One simple way to load WordPress for your PHP driven stylesheet is to add an endpoint to WordPress: a custom, reserved URL where you load your template file. To get there you have to: … Read more
Use Nonces (when not using Settings API) Plugins and Themes should explicitly provide Settings-page nonce checking, if not using the Settings API: WordPress Nonces (Codex) WordPress Nonces (Mark Jaquith) Improving security in WordPress plugins using Nonces (Vladimir Prelovac) 5 tips for using AJAX in WordPress > 3. Use nonces and check for permission (Gary Cao)
I fixed this by going through PHPMyAdmin to the table “Options” and then the row active_plugins. I had the following stored there (formatted for readability): a:10:{ i:0;s:49:”1and1-wordpress-wizard/1and1-wordpress-wizard.php”; i:1;s:29:”acf-repeater/acf-repeater.php”; i:2;s:30:”advanced-custom-fields/acf.php”; i:3;s:45:”limit-login-attempts/limit-login-attempts.php”; i:4;s:27:”redirection/redirection.php”; i:6;s:33:”w3-total-cache/w3-total-cache.php”; i:7;s:41:”wordpress-importer/wordpress-importer.php”; i:8;s:24:”wordpress-seo/wp-seo.php”; i:9;s:34:”wpml-string-translation/plugin.php”; i:10;s:38:”wpml-translation-management/plugin.php”; } I added a new line (for the missing plugin) and incremented the a:10 to a:11 to indicate that … Read more
As a reference To create network or global settings, you need to do the following Add a settings page add_submenu_page( ‘settings.php’… # cf options.php for blog level` Add a global option add_site_option($key,$value) Update a global option update_site_option($key,$value) Get a site option get_site_option($key) Global settings are saved to the sitemeta table (individual blog settings are saved … Read more
When WordPress activates a plugin, it calls the activate_plugin() function. This function activates the plugin in a sandbox and redirects somewhere else on success. It’s been used by a few authors to programmatically activate plugin dependencies. There’s another function, deactivate_plugins(), that does a similar thing in reverse … it’s actually how WordPress deactivates plug-ins when … Read more
This is how I did it in some web apps: function run_activate_plugin( $plugin ) { $current = get_option( ‘active_plugins’ ); $plugin = plugin_basename( trim( $plugin ) ); if ( !in_array( $plugin, $current ) ) { $current[] = $plugin; sort( $current ); do_action( ‘activate_plugin’, trim( $plugin ) ); update_option( ‘active_plugins’, $current ); do_action( ‘activate_’ . trim( … Read more