Chaining Static and Public Methods in PHP

To chain a static and a public method through class name, for example:

className::staticMethod()->publicMethod()

The instance of the className must be returned in the staticMethod, using "return new self" .
- Code example:

<?php
class clsShow {
  public static $url;

  public static function setData(){
    self::$url = 'https://coursesweb.net/';
    return new self;
  }

  public function show(){
    echo self::$url;
  }
}

// accessing show() method after setData()
clsShow::setData()->show();             // https://coursesweb.net/

• To this page: PHP Method Chaining it is a lesson with more details and examples about chaining multiple methods.

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Daily Test with Code Example

HTML

CSS

JavaScript

PHP-MySQL

Which tag renders as emphasized text, displaying the text oblique?

<p>Web development courses: <em>CoursesWeb.net</em></p>

Which CSS property defines the space between the element border and its content?

margin padding position

h3 {
  padding: 2px 0.2em;
}

Click on the method which returns the first element that matches a specified group of selectors.

getElementsByName() querySelector() querySelectorAll()

// gets first Div with class="cls", and shows its content
var elm = document.querySelector("div.cls");
alert(elm.innerHTML);

Indicate the PHP variable that contains data from a form sent with method="post".

$_SESSION $_GET $_POST

if(isset($_POST["field"])) {
  echo $_POST["field"];
}

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