Tutorial by Topics: d

Yii2 has some built-in validators which can be used while solving programming related or general puprose validations. When you need to create a new business logic validation you need to create your own validators.

This function is to add an item in the admin panel's nav bar. add_menu_page( $page_title, $menu_title, $capability, $menu_slug, $function, $icon_url, $position) ParameterDetails$page_title(string) The text to be displayed in the title tags of the page when the menu is selected.$menu_titl...

This function is to add a sub-item to an existing item in the admin panels nav bar. add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $function ) ParameterDetails$parent_slug(string) The slug name for the parent menu (or the file name of a standard WordPr...

tidyr has two tools for reshaping data: gather (wide to long) and spread (long to wide). See Reshaping data for other options.

Whenever you work with video feeds you may eventually want to save your image processing result in a form of a new video file. For simple video outputs you can use the OpenCV built-in VideoWriter class, designed for this. It is useful to look at some concepts before using them. These concepts are co...

This topic is about how to limit access to your docker containers from outside world using iptables. For impatient people, you can check the examples. For the others, please read the remark section to understand how to build new rules. iptables -I DOCKER [RULE ...] [ACCEPT|DROP] // To add a r...

In this post I will demonstrate how to pass external data to Angular app before the app bootstraps. This external data could be configuration data, legacy data, server rendered etc.

What is Dynamic Method Dispatch? Dynamic Method Dispatch is a process in which the call to an overridden method is resolved at runtime rather than at compile-time. When an overridden method is called by a reference, Java determines which version of that method to execute based on the type of object...

Proguard is free Java class file shrinker, optimizer, obfuscator, and preverifier. It detects and removes unused classes, fields, methods, and attributes. It optimizes bytecode and removes unused instructions. It renames the remaining classes, fields, and methods using short meaningless names. ...

Elastic Beanstalk is a Cloud PaaS provider (Platform as a Service), meaning applications can be deployed to the platform without the fuss of manually setting up a deployment environment. Java applications are easily deployable to Elastic Beanstalk both via web interface or via command-line tools. ...

The function allows user to load stylesheets for the TinyMCE editor add_editor_style( $stylesheet ) ParameterDetails$ stylesheet(array or string) (Optional) Stylesheet name or array thereof, relative to theme root. Defaults to 'editor-style.css'

This function registers features that the theme supports. add_theme_support( $feature ) ParameterDetails$feature(string) The feature being added. List of features to be used in $feature: 'post-formats' 'post-thumbnails' 'html5' 'custom-logo' 'custom-header-uploads' 'custom-head...

sub and gsub are used to edit strings using patterns. See Pattern Matching and Replacement for more on related functions and Regular Expressions for how to build a pattern.

Android supports all Java 7 language features and a subset of Java 8 language features that vary by platform version. This page describes the new language features you can use, how to properly configure your project to use them and any known issues you may encounter.