Php-mysql Course

To chain a static and a public method through class name, for example:
The instance of the className must be returned in the staticMethod, using "return new self" .
- Code example:
class clsShow {
  public static $url;

  public static function setData(){
    self::$url = '';
    return new self;

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

// accessing show() method after setData()
clsShow::setData()->show();             //

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

Daily Test with Code Example

Which tag is used to include external CSS file in web page?
<body> <script> <link>
<link href="/templ/style.css" rel="stylesheet" type="text/css" />
Which CSS property sets the text size?
font-weight text-decoration font-size
h2 {
  font-size: 1em;
Indicate the JavaScript property that can add HTML code into an element.
text value innerHTML
document.getElementById("someID").innerHTML = "HTML content";
Click on the function that returns the number of characters of a string in PHP.
count() strlen() stristr()
$str = "";
$nr_chr = strlen($str);
echo $nr_chr;       // 22
Chaining Static and Public Methods in PHP

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